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

 

【答案】

C

【解析】

試題分析：句意：當我到達他們家的時候，沒有燈光。他們不可能在家。can’t have been不可能發(fā)生了某事，情態(tài)動詞表示推測，用于對過去發(fā)生的事情的否定推測，故選C

考點：情態(tài)動詞表虛擬

點評：情態(tài)動詞和完成時態(tài)一起表示虛擬，特別值得注意的是各個情態(tài)動詞的意思，must have done表示過去肯定做了某事，can have done表示本能夠做某事而實際未做，should have done表示本應該做某事而未做，need have done表示本有必要做某事而實際沒有做，注意沒有mustn’t have done 的形式。

 

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