—Must we do our homework first? —No, you___. You may have a rest first.

A. mustn't B. needn't C. may not D. can't

B 【解析】句意：--我们首先必须做作业吗？-不必了，你们可以先休息一下。A. mustn't禁止，不要； B. needn't不必；C. may not 也许不；D. can't不能，不会，表示推测“不可能”。 Must we…?的否定回答可以用No, you don’t have to ./No, you. needn't；以must引出的一般疑问句，其肯定回答通常是用must来回答。根...

I told Sally how to get here, but perhaps I _______ for her.

A. had to write it out B. must have written it out

C. should have written it out D. ought to write it out

C 【解析】句意：我告诉Sally如何到达这里，但是也许我应该给她写出来。A. had to write it out不得不把它写出来； B. must have written it out一定把它写出来了，表示对过去的一种推测，说话的语气很肯定；C. should have written it out应该把它写出来，表示过去应该做的事情而没有做； D. ought to write i...

—There were already five people in the car but they managed to take me as well.

—It _______ a comfortable journey.

A. can’t be B. shouldn’t be

C. mustn’t have been D. couldn’t have been

D 【解析】句意：--车里已经有五个人了，但是他们还设法带着我。--它不可能是一次舒适的旅行。A. can’t be不可能是，是对现在的推测； B. shouldn’t be不应该是，是对现在的推测。根据第一句可知，这里的旅行发生在过去，所以对现在的推测的选项是不正确的，故排除AB； must have done“一定做过某事”表示对过去的推测,不能用于否定句，故排除C；D. coul...

It’s nearly seven o’clock. Jack _______ be here at any moment.

A. must B. Need C. should D. can

C 【解析】句意：接近七点了，杰克随时会来到这里。A. must一定，表示推测时，语气比较肯定； B. need需要； C. should应该，语气较肯定，通常是指非常可能的事（暗示有一定的事实根据或合乎常理）；D. can可能，表示推测时，一般用于否定句或疑问句。根据It’s nearly seven o’clock.可知，一般情况下这个时间杰克会来这里，有一定的根据，也就是安常理来说这个...

Johnny, you _______ play with the knife, you _______ hurt yourself.

A. won’t; can’t B. mustn’t; may

C. shouldn’t; must D. can’t; shouldn’t

B 【解析】句意：Johnny，你不要玩刀，你也许会伤到自己。A. won’t不将; can’t 不能；B. mustn’t禁止，不应该; may也许；C. shouldn’t不应该; must一定，表示推测的可能性大； D. can’t不可能; shouldn’t不应该。play with玩弄。第一空表示的是禁止做某事，禁止玩刀；玩刀也许会伤到自己，不能说一定会伤到自己。故选B。 ...

The fire spread through the hotel very quickly but everyone _______ get out.

A. had to B. would

C. could D. was able to

D 【解析】句意：火在旅馆蔓延地很快，但是每一个人都逃出去了。A. had to不得不； B. would过去将来；C. could能，表示过去有某种能力，但不一定会去做； D. was able to经过努力做到了。根据The fire spread through the hotel very quickly火蔓延地很快， but表示前后是转折关系，火虽然很大，但是人们还是逃出去了。表示...

—When can I come for the photos? I need them tomorrow afternoon. —They _______ be ready by 12:00.

A. can B. should C. might D. need

B 【解析】句意：--什么时间我能来取照片？我明天下午需要它们。--它们应该在12点之前准备好。答语人在此用的是推测语气。can表推测时，只能用于疑问句和否定句，且常推测现在和过去，不能推测将来。might可推测将来，但语气极不肯定，用于此处不符合答话人的身份。should亦可用于推测将来，其语气比较肯定，意为“一定会，想必会”，根据I need them tomorrow afternoo...

—I stayed at a hotel while in New York. —Oh, did you? You _______ with Barbara.

A. could have stayed B. could stay

C. would stay D. must have stayed

A 【解析】句意：--在纽约的时候我住在旅馆里。--哦，是吗？你本来可以和Barbara住在一起。A. could have stayed过去本来可以做的而未做；B. could stay能够住在；C. would stay过去将住在； D. must have stayed过去一定住。根据I stayed at a hotel while in New York可知，在纽约的时候是住在旅馆...

--- Are you coming to Jeff’s party?

--- I’m not sure. I _______ go to the concert instead

A. must B. would C. should D. might

D 【解析】 试题分析：must必须，一定；would将要；should应该；might可能，表示推测语气。句意：你来参加杰夫的聚会吗？——我不确定。我可能要去参加音乐会。结合语境可知下文表示推测，故选D。

I was really anxious about you. You _______ home without a word.

A. mustn’t leave B. shouldn’t have left

C. couldn’t have left D. needn’t leave

B 【解析】句意：我真地很担心你，你不应该没有说一句话就离家出走了。couldn’t have done过去不可能做了某事；态动词+动词原形是对现在或未来的推测，不符合句意，故排除选项AD；根据I was really anxious about you.可知，这里的担心发生在过去，所以离开家也发生在过去，对过去的动作的一种责备用shouldn’t have done不应该做某事而做了。故选...