When I went to their house, there was no light on. They _____ at home.
A．can’t beB．couldn’t be
C．can’t have beenD．mustn’t have been
C

試題分析：句意：當(dāng)我到達(dá)他們家的時(shí)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(dòng)詞表示推測(cè)，用于對(duì)過去發(fā)生的事情的否定推測(cè)，故選C
點(diǎn)評(píng)：情態(tài)動(dòng)詞和完成時(shí)態(tài)一起表示虛擬，特別值得注意的是各個(gè)情態(tài)動(dòng)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(shí)際未做，should have done表示本應(yīng)該做某事而未做，need have done表示本有必要做某事而實(shí)際沒有做，注意沒有mustn’t have done 的形式。
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