高一英语情态动词专项训练及答案

高一英语情态动词专项训练及答案

一、单项选择情态动词

1．-–Mary knows the city quite well.

--She______ well have been there before.

A．need B．could C．should D．may

【答案】D

【解析】

【分析】【详解】

考查情态动词辨析。句意：——Mary非常了解这个城市。——她肯定以前在那里呆过。may have done过去可能做过某事。表示对过去的肯定猜测。need have done本需要做某事却没做；could have done本可以做某事却没做；should have done本应该做某事却没做。故选D。

2．—I have something important to tell John. But I can’t find him.

—His cell phone is here, so he ________ have gone too far.

A．mustn’t B．needn’t

C．wouldn’t D．can’t

【答案】D

【解析】

【详解】

考查情态动词。句意：——我有重要的事情要告诉John，但是我找不到他。——他的手机在这儿，所以他不可能走得太远。根据句意可知，此处是对过去的一种猜测，此处是表达不可能……，用can’t have done。故选D。

3．The accident which left 15 people on board dead ________ if both the angry female passenger and the bus driver had kept calm.

A．should have avoided B．should be avoided

C．could have avoided D．could have been avoided

【答案】D

【解析】

【详解】

考查“情态动词+完成式”。句意：如果愤怒的女乘客和巴士司机保持冷静，这起导致15人死亡的事故本来是可以避免的。could have done“本来能做而没有做”，且句子主语The accident和谓语动词avoid之间是被动关系，结合句意可知答案为D。

【点睛】

情态动词+ have done结构：

1.“must + have + 过去分词”表示对过去发生的事情或状态进行推测，语气比较坚定，通常只用于肯定句。如：It must have rained last night,for the ground is wet.

2.“can / could + have + 过去分词”表示对过去某种情况的怀疑或不确定。can和could一般用于否定句和疑问句，could的语气较can弱。如：He can't have finished the work so soon.

3.“may / might + have + 过去分词”表示对已发生的动作或存在的状态进行不肯定的推测，might的语气比may弱一点。这种结构主要用于肯定句和否定句，疑问句改用can或could。如：They may not have known it beforehand.

4.“need + have + 过去分词”表示过去做了不必做或不需要做的事情，或过去做某事纯属多余。如：I needn't have bought so much wine—only five people came.

5.“should / ought to + have + 过去分词”表示过去本该做某事但没做，其否定式表示过去不该做某事但做了，这种句式含有不满或责备之意，ought to的语气比should强一些。如：You ought to / should have studied harder. 你本应该更努力学习的.（但没有）

He oughtn't to / shouldn't have done that. 他本来就不该做那件事.（可是做了）

6.“would ＋ have ＋过去分词”表示对过去的某种情况进行猜测，或本来要做某事却因某种原因未做成，通常用来说明某一情况，但不像用should或ought to那样含有责备之意。如：

I guess the poet would have been about twenty when she wrote her first poem.

Another worker wouldn't have acted like that.

4．It is really cold and the ground is wet; it ________ have rained last night.

A．might B．must

C．can D．should

【答案】B

【解析】

【详解】

考查情态动词辨析。句意：天气很冷而且地面是湿的，昨晚一定下了雨。根据上文the ground is wet可知，“昨晚下了雨”是肯定的，故用must have done“必定做了……”表示对过

去十分有把握的推测，故选B。

【点睛】

must have done用法辨析

must have done：表示对过去的肯定的逻辑推测，推定某件事情、动作或状态可能在过去发生过（存在过）。

He must have been a doctor, for he knows medicine so well. 他过去肯定是一位医生，他对医学如此了解。

Somebody must have stolen the ring. 肯定有人偷了这枚戒指. [该句所推断的偷窃动作发生在过去.]

The temperature must have dropped to below zero last night, because the water is frozen all over.昨夜的温度肯定降到零度以下，因为水都冻住了。

如果“must + have + 过去分词”句型与by now连用，还可以表示对现在完成的动作和状态的肯定推测，但实质上还是指所推测的过去的动作。例如：

They started early this morning; they must have arrived by now. 他们今晨很早就出发了，现在

肯定已经到了。

中国学生的常见病句是：They...; they certainly have arrived.病句的句义是“他们当然已经到达了。”（这不是对过去的肯定推测，而是断定动作已经完成。）

5．One of our rules is that every student _______ wear school uniform while at school. A．might B．could

C．shall D．will

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：我们其中一条规则要求每个学生在校期间都要穿校服。shall可以表示“命令，警告，强制要求；允诺；法律，规定要做……”，结合句意可知C正确。

6．— Mum, little Ray broke his toys again!

—It doesn't matter. You see, accidents _____happen.

A．shall B．should C．must D．will

【答案】D

【解析】

【详解】

考查情态动词辨析。句意：——妈妈，小雷又弄坏了他的玩具。——没事的，你看，意外总会发生。A. shall将要，会；B. should应当；C. must必须；D. will总是。Will可以表示习惯，意思为“惯于，总是”。故D选项正确。

【点睛】

will/would是情态动词，其表达的意思如下。

(1)表示意志或意愿：决心，愿意，……好吗?

We will do our best to save the child. 我们会尽力抢救这个孩子。

I told her to stop crying, but she just wouldn’t listen. 我叫她别哭，可她就是不愿听。

注：表示请求、建议或征求对方意见时，用Would you…? 比用Will you…?更婉转。如：Will/Would you please keep the door open? 请让门开着好吗?

Will/Would you go with me? 你愿意和我一起去吗?

(2)表示真理或习惯：惯于，总是。如：

Oil will float on water. 油总是浮在水面上。

She will listen to music alone in her room for hours. 她独自在房间里听音乐，一听往往就是几小时。

He would get up early when he lived in the country. 他住在乡下时总是早起。

(3)表示要求：一定，必须。如：

You will report to me afterward. 你稍后一定要向我报告。

(4)表示猜测：可能，大概。如：

This will be the house you’re looking for. 这大概就是你找的那所房子了。

(5)表示功能：能。如：

This auditorium will/would seat one thousand people. 这个礼堂能容纳一千人

分析句子可知，本句中的will表示习惯，意思为“惯于，总是”且符合语境。故D选项正确。

7．The professor warned the students that on no account ________ use mobile phones in his class.

A．should they B．they should

C．dare they D．they dare

【答案】A

【解析】

【详解】

考查部分倒装和情态动词。句意：这位教授警告学生们，在他的课堂上，决不应该使用手机。on no account意为“决不”，否定词放在句首，句子使用部分倒装，排除B、D项；这里表示应该，故选A。

8．It_____ have been Tom that parked the car here, as he is the only one with a car.

A．may B．can C．must D．should

【答案】C

【解析】

【详解】

考查情态动词表猜测的用法。句意：一定是汤姆把车停在这儿的，因为他是唯一有车的人。A. may可能；B. can可能；C. must一定；D. should应该。由as he is the only one with a car.可知一定是他把车停在这里的，非常有把握的肯定推测，故选C。

9．No student ________ go out of school to have lunch without permission of the headteacher. A．might B．must

C．shall D．could

【答案】C

【解析】

【详解】

考查情态动词。句意：未经校长允许，任何学生不得离开学校去吃午饭。might可能；must一定，必须；shall会，将；could能够。本句是一条禁令。shall用于肯定句并且主语是第一、三人称时，表示允诺，警告，劝告等语气。故选C。

10．I love the weekend, because I ________ get up early on Saturdays and Sundays. A．mustn’t B．needn’t

C．wouldn’t D．shouldn’t

【答案】B

【详解】

考查情态动词。句意：我喜欢周末，因为周六周日不必早起。A. mustn’t不能，禁止；B. needn’t不必；C. wouldn’t不会；D. shouldn’t不应该。此处表示“不必”，故B项正确。

11．It has been announced that all the students ________ put on masks before going to school in case they are infected with SARS virus.

A．shall B．will C．need D．may

【答案】A

【解析】

【详解】

【详解】

考查情态动词。句意：所有学生们应在去学校之前带上口罩以防感染非典病毒，这已经被宣布。shall用于第二、第三人称，表示说话人给对方命令、警告、允诺或威胁，故选A 项。

12．Mark ______ have hurried. After driving at top speed, he arrived half an hour early. A．needn’t B．wouldn’t C．mustn’t D．couldn’t

【答案】A

【解析】

考查情态动词。need’t have done 本不必要做某事，句意：迈克本不必要着急的。他以全速驾驶后，他早到了半个小时。wouldn’t不会，mustn’t禁止，couldn’t不可能，所以选A。

13．Our English teacher is considerate，helpful，and warm-hearted，but sometimes

she________________ be angry at our silly mistakes.

A．should B．must

C．can D．shall

【答案】C

【解析】

【详解】

考查情态动词。句意：我们的英语老师很体贴、乐于助人、热心肠，但有时她可能为我们愚蠢的错误而发火。can表示一种客观的可能性，但不一定会发生，故C项正确。

14．Look! There are so many mistakes in your composition. You ________ have fixed full attention on it.

A．can B．should

C．need D．might

【答案】B

【解析】

考查情态动词。句意：看！你的作文里有那么多的错误。你本应该把所有的注意力都集中在它上面的。表示“本应该做但实际上没有做”应该用should have done结构，can have done 表示可能；need表示需要；might have done表示可能做过某事；故选B。

15．—Where is my dictionary?I remember I put it here yesterday.

—You___it in the wrong place.

A．must put B．should have put

C．might put D．might have put

【答案】D

【解析】

【详解】

考查情态动词。句意：——我的词典在哪里？我记得昨天放在这里了。——你或许放错了地方。“might have +动词+ed形式”表示过去可能完成的动作。根据所提供的情景Where is my dictionary? I remember I put it here yesterday.可判断出把词典放在某个地方发生在过去，所以要用“might have +动词+ed形式”。“should have + 动词+ed形式”表示“(过去)本来应该做某事”。must意为“一定”，是肯定的推测，与所提供的情景的矛盾。might put表示现在发生的事。故选D。

16．It turned out that the hotel was so near. I ______ the taxi.

A．needn't have taken B．must have taken C．should take D．could take

【答案】A

【解析】

【详解】

考查情态动词。句意：结果证明这家宾馆非常近。我本不必乘坐出租车。needn’t have done表示“本不必做某事实际上做了”，根据句意，旅馆很近不用乘坐出租车，但是乘车了。故选A。

17．Tom, you _____ leave all your clothes on the floor like this!

A．wouldn’t B．mustn’t C．needn’t D．may not

【答案】B

【解析】

【详解】

考查情态动词辨析。句意：汤姆，你不要把所有的衣服都这样扔在地板上! A. wouldn’t 不会； B. mustn’t 禁止；C. needn’t不需要；D. may not不可以。本句为祈使句，所以mustn’t “禁止”符合句意。故选B项。

18．—What’s wrong with the door?

—The key has got stuck in it and ______ come out.

A．shouldn’t B．mustn’t C．needn’t D．won’t

【答案】D

【解析】

【详解】

考查情态动词。句意：---门怎么了?---钥匙卡在里面出不来了。A. shouldn’t不应该；B. mustn’t禁止；C. needn’t 不需要；D. won’t不会。won’t表示拒绝时，其主语有时可以是“物”。故选D项。

19．Skills like critical thinking and analysis ________ be found on the Internet, because they must be acquired in the context of facts.

A．can’t B．needn’t C．mustn’t D．shouldn’t

【答案】A

【解析】

【详解】

考查情态动词词义辨析。句意：像批判性思维和分析这样的能力，是不能在互联网上找到的，因为它们必须基于事实来获得。A. can’t无法，不可能；B. needn’t不需要；C. mustn’t 不可以，禁止；D. shouldn’t不应该。本题讲的是这种批判性思维的能力无法通过浏览鱼龙混杂的网上信息获得，表达的是客观上的不可能，故选A。

20．—You rang me up at about 10:00 last night, didn't you?

—No, I didn't phone you. It someone else.

A．must have been B．could be C．must be D．could have been 【答案】A

【解析】

【详解】

考查情态动词+have done。句意：“昨晚10点左右你给我打了电话，是吗？”“不，我没给你打电话。一定是别人干的。” must have done 是对过去发生的动作最有把握的猜测，意思是“一定”，结合语境可知，我没有打电话给你，因此猜测一定有别人给你打了电话。故选A 项。

21．-- Catherine, I have cleaned the room for you.

---Thanks. You _______ it. I could manage it myself.

A．needn’t do B．shouldn’t have done C．mustn’t do D．needn’t have done 【答案】D

【解析】

【详解】

考查情态动词辨析。句意: ---凯瑟琳，我已经为你打扫了房间。 - - -谢谢。你本不必这么做

的。我自己能行。A. needn’t do不必做某事；B. shouldn’t have done本不应该做某事； C. mustn’t do禁止做某事；D. needn’t have done本不必做某事。由“Thanks. I could manage it mysel f”可知，needn’t have done“ 本不必做某事，而实际上做了某事”符合句意。故选D

项。

22．Mr. Smith is almost on time for everything. How ________ it be that he was late for the meeting?

A．can B．should C．may D．must

【答案】A

【解析】

【详解】

考查情态动词辨析。句意：史密斯先生几乎任何事情都是准时的。他怎么可能开会迟到了？ A. can可能，可能性，表示可能性时，常用于否定句和疑问句中，且有时还带有“惊奇、不相信” 等感情色彩。B. should 应该； C. may也许，表示可能性时常用于肯定句中，不用于疑问句中。D.must常用于肯定句中表推测，“一定……”的意思；本题是强调句型的一个变式：强调其特殊疑问句how的形式。根据前句“斯密斯先生几乎是很准时”可推测出“怎么可能开会迟到呢？”。根据句意可知，用于疑问句中的“可能性”且有不相信的色彩，四个选项只有“can”符合题意。故选A

【点睛】

情态动词就是表示说话者对事情的一种看法，也就是一种语气。情态动词的用法一直是命题者常设置的考点和重点，平时要加强记忆。

23．--- I called you last night, but no one answered.

--- Sorry, I _______ sleeping.

A．must have done

B．would have been

C．must be

D．could be

【答案】C

【解析】

【详解】

考查情态动词。句意：—昨晚我给你打电话了，但没人接。—对不起，我一定是睡着了。分析可知，前文提及打电话无人应答，后文解释原因：肯定睡着了。情态动词must可用于must be+v-ing 表示“过去肯定在做某事”，符合句意要求。故选C项。

24．AI will surely be a feature of future life, but it _____ be used responsibly and in a proper way. A．can B．need C．must D．will

【答案】C

【解析】

【详解】

考查情态动词。句意：人工智能肯定会成为未来生活的一个特征，但必须以负责任的方式和适当的方式使用它。A. can能够；B. need需要；C. must必须；D. will将会。此处为情态动词的一般用法，结合句意表示“必须”，故选C。

25．You ________ be Carol. You haven’t changed a bit after all these years.

A．must B．can C．will D．shall

【答案】A

【解析】

【详解】

考查情态动词。句意：你肯定是卡罗，这些年你一点也没有变化。must表示对现在的肯定推测；can表示推测，表示可能性；will表示意愿；shall表示表示决心、命令或指示。根据下文“这些年你一点用没有改变”可知，前文表示肯定性推测。故选A。

【点睛】

must表推测的用法must表示很有把握的推测，其意为“一定会”“肯定会”，只用于肯定句，一般不用于否定句或疑问句。表示对现在或未来的情况作推测，后接动词原形。You have worked hard all day. You must be tired. 你辛苦一整天，一定累了（对现在情况的推测判断）I didn’t hear the phone. I must have be asleep. 我刚才没有听到电话，我想必是睡着了。

26．You _____ be right but I’m going back to check anyway.

A．should B．must C．need D．might

【答案】D

【解析】

【详解】

考查情态动词。句意：你或许是对的，但我还是要回去核对一下。A. should应该；B. must 一定，必须；C. need需要；D. might或许。本题主要考查情态动词表示推测的用法，由I’m going back to check anyway可知，我对此不确定。由此可知，D项符合题意。故选D项。【点睛】

can / could用于表推测的用法

(1) 从使用句型上看，can 通常只用于否定句或疑问句，一般不用于肯定句，而could 可用于肯定句、否定句和疑问句。两者没有时间上的差别，只是could 比 can 更委婉，更不确定。

(2) 从时间关系看，对现在或将来情况作推测，后接动词原形；对正在进行的情况作推测，后接 be doing 结构；对过去情况作推测，后接动词完成式。

二、 may / might用于表推测的用法

表示推测，两者都可用，只是 might 比 may 语气更不确定，表示的可能性更小。如本题，根据I’m going back to check anyway可知，我对此不确定。由此可知，D项符合题意。(1) 在句型使用方面：两者均可用于肯定句和否定句，但用于疑问句时，may通常不用于句首，但可用于疑问句的句中（如特殊疑问句等），而might尽管可以用于疑问句的句首，但不

算普通，通常会改用其他句式（如用could等）。

三、must表示推测的用法

must 表示很有把握的推测，其意为“一定会”“肯定会”，只用于肯定句，一般不用于否定句或疑问句。表示对现在或未来的情况作推测，后接动词原形；表示对过去情况的推测，接动词完成式。

27．—I heard they went skiing in the mountains last winter.

—It true because there was little snow there.

A．may be not B．won’t be C．couldn’t be D．mustn’t be

【答案】C

【解析】

【详解】

考查情态动词辨析。句意：我听说他们去年冬天去山里滑雪。--不可能是真的，因为那里几乎没有雪。A. may be not可能不；B. won’t be 不会；C. couldn’t be不可能是；D. mustn’t be禁止。根据because there was little snow there.可知这里是否定推测，couldn’t be“不可能是”符合句意，故选C项。

28．--- Oh, my God! I just missed the last bus back home.

--- That’s really bad. I’m sure you ______ it, but you just didn’t hurry up.

A．had caught B．could have caught C．could catch D．can catch

【答案】B

【解析】

【详解】

考查情态动词+have done结构。句意：——哦,我的上帝!我刚好错过了回家的末班车。——这是非常糟糕的。我肯定你能赶上，但你就是不抓紧。could have done“本来能做而没有做”。故选B。

29．-- Did Jim come?

-- I don’t know. He _______ while I was out.

A．might have come B．might come

C．must have come D．should have come

【答案】A

【解析】

【详解】

考查情态动词推测用法。句意：Jim来了吗？--我不知道，在我不在的时候，可能来过。根据前文I don’t know.可知，说话者不知道Jim来没来，因此后文推测来过，但是语气很不确定，故可知选A。对过去情况的推测为情态动词+have done，must have done 一定做了某事，should have done 应该来过，不符合，故选A。

【点睛】

情态动词+have+过去分词的用法，表示推测或判断过去的情况。

can/could+have+过去分词用法：①多用于否定句和疑问句中。表示对过去某事发生的可能性的否定或质疑，意为：不可能（已经）......了-（否定句）/可能（已经）......了嘛？-（疑问句）②用于肯定句中。表示对过去没有做某事的遗憾，含有轻微的责备，意为：本来可以......的（但实际上没有......）。You could have done better, but you were too careless.（肯定句。他能做得更好的）

should/ought to+have+过去分词用法：用于肯定句中。表示对过去没有做某事的遗憾，含有责备的意思，意为：本来应该......的（但实际上没有......）。用于否定句中-表示对过去已经做了某事的责备，意为：本来不应该......的（但实际上已经......了）。He should have been asleep.（肯定句，他本应去睡觉的）He shouldn't have been asleep.（否定句，他本来不应该去睡觉的）。

may/might+have+过去分词用法：用于肯定句和否定句中，表示对过去发生某事的可能性的推测，意为：或许（已经）....../或许还没有......。It is too late. He may have gone to bed. must+have+过去分词用法：表示对过去发生的事情十分肯定的推测。must表示推测时，不能用在否定句和疑问句中。I must have forgotten to tell you.（must 的引入，表达了说话者对过去忘记告诉你的这件事肯定推测）

needn't+have+过去分词

用法：表示对过去已经做了某事的后悔，意为：本来可以不必......的（可实际上却已经......）You needn't have taken a taxi here, for it was very near to my home.

30．-- Turn off the TV, Jack. _______ your homework now?

-- Mum, just ten more minutes, please.

A．Will you be doing B．Should you be doing

C．Shouldn't you be doing D．Couldn’t you be doing

【答案】C

【解析】

【详解】

考查含情态动词的进行时态。句意：——把电视关掉，杰克。你现在不应该做作业吗?——妈妈，请再给我十分钟。此处表示目前应该在做某事，should“应该”，这里用含情态动词的进行时态，故选C。

31．Days later, my brother called to say he was all right, but _______say where he was. A．mustn’t B．sho uldn’t C．wouldn’t D．mightn’t

【答案】C

【解析】

考查情态动词。句意：“数天后，我弟弟打电话说他很好，但不肯告诉我他在哪

里。”mustn’t“禁止”；shouldn’t“不应该”；wouldn’t“不情愿”；mightn’t“不可能”。

32．The new supermarket has announced that the first to purchase goods on the opening day

________ get a big prize.

A．must B．could

C．would D．shall

【答案】D

【解析】

【详解】

考查情态动词的用法。句意：新开业的超市宣布，开业当天首先购物的人会得到大奖。shall 用于二三人称的陈述句中可以表示说话人的承诺，命令，警告等，此处表示超市的承诺，故选D。

33．They were abroad during the months when we were carrying out the investigation, or they __________to our help.

A．would have come B．could come

C．have come D．had come

【答案】A

【解析】

试题分析：本句考查的是一个含蓄的虚拟条件句，句中的or相当于if they had not gone abroad.因为前面句中使用的是were，说明这个虚拟语气是与过去事实相反，所以主句中使用的是“情态动词+have done”的形式。句意：当我们在做调查的那几个月里，他们一直在国外，否则的话他们早就来帮助我们了。故A正确。

34．If you wish, you ________ come in and have a cup of tea with us any time.

A．would B．should C．must D．may

【答案】D

【解析】

【详解】

考查情态动词词义辨析。句意：如果你愿意，你可以任何时候过来和我们一起喝杯茶。A. would会，过去常常；B. should应该；C. must必须；D. may可以，可能。结合句意可知，此处用“可以”符合语境，故选D项。

35．I use a clock to wake me up because at six o'clock each morning the train comes by my house.

A．couldn't B．mustn't

C．shouldn't D．needn't

【答案】D

【解析】

试题分析：考查情态动词辨析。A不可能；B禁止，千万不能；C不应该；D不需要；句意：我不需要使用闹钟叫醒我，因为每天早上六点都有一列火车经过我的家旁边。根据句

意可知我不需要使用闹钟。故D正确。

考点：考查情态动词词义辨析

36．The door ________ open, no matter how hard she pushed.

A．shouldn’t B．couldn’t

C．wouldn’t D．mightn’t

【答案】C

【解析】

【详解】

考查情态动词。句意：无论她怎么使劲推，门就是打不开。A. shouldn’t不应该；B. couldn’t 不能够；C. wouldn’t不愿意；D. mightn’t可能不。will及其过去式would均可表示一种倾向性、习惯。故选C。

37．–Will you read me a story, Mummy?

--OK. You ______have one if you go to bed as soon as possible.

A．might B．must C．could D．shall

【答案】D

【解析】

【分析】

【详解】

考查情态动词。句意：——妈妈，给我讲个故事好吗？——好，如果你尽快上床睡觉，我就给你讲一个。might表示“或许”；must表示“必须”；could表示“可能”；shall在此处表示“允诺”，符合句意，故选择D项。

38．—Isn’t that Ann’s husband over there?

— No, it ________ be him —I’m sure he doesn’t wear glasses.

A．must not B．can’t C．won’t D．may not

【答案】B

【解析】

【详解】

考查情态动词：句意：那不是安的丈夫吗？---不，肯定不是他，我确定他不戴眼镜。A. must not禁止;B. can’t 不能;C. won’t不会;D. may not可能不。表示否定的推测，不可能，用can’t。故选B项。

39．Although you ______ find bargains in London, it’s not generally a cheap place to shop. A．should B．need C．must D．can

【答案】D

【解析】

【详解】

考查情态动词辨析。句意：尽管你能在伦敦找到便宜货，但是一般不是购物便宜的地方。

A. should应该；

B. need需要；

C. must必须；

D. can能。 can用在否定句和疑问句中可以表示具体的可能性，用在肯定句中表示理论上的可能性，本句中在伦敦可能能买到便宜货就是理论上的可能性，用can表示。故选D。

40．Sometimes it seems that doors ___________ be closed for you, but remember, they are not all locked.

A．must B．should C．may D．need

【答案】C

【解析】

【详解】

考查情态动词的用法。句意：有时候，似乎大门正对你关闭，但请记住并非所有大门都被上了锁。A. must一定，必须；B. should应该；C. may可能，也许；D. need需要。本句不宜使用绝对化的语气，从sometimes，seems等提示词可看出应使用较为温和的推测语气，因此may be（或许，也许）符合语境，而过于绝对的推测，如must be（一定是，肯定是）应予排除。此外should和need在此并不表示推测，更不符合本句语境。故选C。

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