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问题

Everyone passed the exam.It _________ difficult.

A:can’t have been
B:must have been
C:couldn’t be
D:might have been
正确答案是:
同类题型

Weareallgoingtothegames.Whydon’tyoucome________?

Hi, Jane! Can you go hiking with me on Sunday— . I have too much homework.

You ________ more careful next time.

Are you fond of watching TV?— Not a bitI would sit alone in the dark _______ I would watch TV

All flights ____ because of the snowstorm, many passengers could do nothing but take the train

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