When I went to their house, there was no light on. They _____ at home.A．can’t be
题型：不详难度：来源：
When I went to their house, there was no light on. They _____ at home.| A．can’t be | B．couldn’t be | | C．can’t have been | D．mustn’t have been |
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答案
| C |
解析
试题分析：句意：当我到达他们家的时候，没有灯光。他们不可能在家。can’t have been不可能发生了某事，情态动词表示推测，用于对过去发生的事情的否定推测，故选C
点评：情态动词和完成时态一起表示虚拟，特别值得注意的是各个情态动词的意思，must have done表示过去肯定做了某事，can have done表示本能够做某事而实际未做，should have done表示本应该做某事而未做，need have done表示本有必要做某事而实际没有做，注意没有mustn’t have done 的形式。 |
举一反三
--- Isn’t that Ann’s husband over there ?
--- No, it _______ be him--- I’m sure he doesn’t wear glasses.| A．can’t | B． must not | C．won’t | D．may not |
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---Fifty dollars for such a T-shirt！You_____ be joking！
--- I’m serious. It’s made of silk. |
| The doctors are doing all that they _____, but the old man is still not breathing properly. |
—May I smoke here? —If you _____, choose a seat in the smoking section.| A．should | B．could | C．may | D．must |
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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 |
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