一、选择题1．-Could you help me with my English homework, Nancy?-Of course I____________. Glad to help.A．could B．can C．must D．do2．-Listen! A wolf is crying!-It _______ be a wolf, because a wolf never comes out at this time.A．mustn’t B．needn’t C．can’t D．d on’t 3．(2018·山东临沂) Could you please speak a little louder? I ______ hear you very well. A．can’t B．mustn’tC．shouldn’t D．needn’t4．Look at the sign! It says “No Smoking!” You ________ smoke here. It’s dangerous. A．mustn’t B．ought not to C．needn’t D．don’t ha ve to5．―I didn’t pass the driving test again.―Don't worry. Just like the weather, life be beautiful all the time.A．can't B．needn't C．shouldn't D．mustn't6．You______ worry about your lessons. Be careful next time and you will get a good mark. A．do n’t need to B．not need C．needn’t to D．don’t need7．A: Is Jim coming by train?B: I’m not sure. He _______ drive his car.A．must B．may C．need D．should8．From March 23rd, 2013, anyone under the age of 14 ________ go into Disneyland alone. A．couldn’t B．mustn’t C．needn’t D．mightn’t9．— Mom, I got a big box from express(快递). What is it?—I’m not sure. It ________be a present from your grandmother.A．should B．might C．must D．will10．—Must I finish the work today, Mum?—No, you ________.You can finish it tomorrow.A．mustn't B．can't C．shouldn't D．needn't 11．—Susan, someone is waiting for you on the phone. It_______ be your sister, but I’m not sure.—Oh, please tell her to call me_______ because I’m busy now.A．might; later B．must; later C．might; late D．must; late12．---You look very pretty, if I say so.---Thanks a lot for saying that.A．must B．may C．will D．have to13．One ______ easily lose his way when he visits or comes to a new place.A．may B．must C．need D．should14．Since the road is muddy,it ________last night, ________?A．must be rained; wasn’t it B．must have rained; didn’t itC．must rained; didn’t it D．must have rained; wasn’t it15．—Must I go out to have dinner with you, Mum?—No, you , my dear. You’re free to make your own decision.A．shouldn’t B．mustn’t C．needn’t D．can’t16．—I feel tired.—You ________ go to bed so late.A．must B．shouldn’t C．should17．—Mum, I’ve signed for a big box by Future Express (快递). What’s in it?—I’m not sure. It ________be a present from your brother.A．need B．must C．may D．will18．（2017 • 湖北省宜昌市中考）—Life is becoming convenient with the Internet.—That’s true! Almost everything be done online.A．must B．would C．should D．can 19．—Could you help me download some Taylor Swift’s songs from Ku Gou?—Sorry, people download music from the Internet without paying, because it’s against the law. A．wouldn’t B．needn’tC．mustn’t D．couldn’t20．一Already five people in the taxi, but the driver managed to take me as well.一Terrible, and it be an uncomfortable journey.A．can B．should C．must D．need21．— May I watch TV for a while?— No, you __________. You have to finish your homework first.A．can’t B．needn’t C．mustn’t D．won’t 22．—Doesn’t Frank like staying at home and looking after his little sister?—_______, but he ________ because both of his parents work.A．Yes; has to B．No; has toC．Yes; doesn’t have to D．No; doesn’t have to【参考答案】***试卷处理标记，请不要删除一、选择题1．B解析：B【解析】【详解】句意：-南希，你能帮我做英语作业吗？-当然可以。

很乐意帮忙。

A. could能；B. can能； C. must必须；D. do做。

could如果是表示“可能、能够”用于一般过去时态时,回答可用could.例如：Could he play the piano two years ago? 肯定回答Yes, he could.否定回答No, he couldn't. 如果表示“委婉、请求的语气”,回答用"can"例如：Could I use your computer? 肯定回答用Yes/ Of course, you can.但不能用Yes, you could.否定回答用Sorry, you can't.不用Sorry, you couldn't 。

依据句意可知此题是表示委婉、请求的语气，故选B。

【点睛】could的用法：could如果是表示“可能、能够”用于一般过去时态时,回答可用could. 例如：Could he play the piano two years ago? 肯定回答：Yes, he could.否定回答：No, he couldn't. 如果表示“委婉、请求的语气时”,回答用"can".例如：Could I use your computer? 肯定回答可用：Yes, you can.但不能用Yes, you could.否定回答可用：Sorry, you can't.不用Sorry, you couldn't .2．C解析：C【解析】【详解】句意：--听! 狼在叫! --它不可能是狼，因为狼从来不会在这个时候出来。

A. mustn’t禁止；B. needn’t没有必要；C. can’t不可能；D. don’t构成一般现在时的否定句。

根据“because a wolf never comes out at this time因为狼从来不会在这个时候出来”，可推断它不可能是狼，故选C。

【点睛】情态动词表推测的用法：can表示“可能”；can’t表示“不可能”；may表示“可能”，must表示“一定”，注意mustn’t表示“禁止”不表示推测，表示否定推测要用can’t.3．A解析：A【解析】【详解】句意：请你说大点声好吗？我不能很好地听到你说的话。

考查情态动词辨析。

can't不能，表示不能够；mustn't不许，表禁止；shouldn’t不应该，表劝诫；needn’t无需，表示没必要。

本句表示“不能够”，根据句意语境，可知BCD三项意思都与句意不合，故选A。

4．A解析：A【解析】【分析】【详解】句意：看这个标志！上面写道“禁止吸烟！“你不能抽烟。

这是危险的。

mustn’t 禁止，不允许；ought not to不应该，不应当；needn’t不必；don’t have to不必。

根据“No Smoking!”可知此处禁止吸烟，所以选A。