The light in his office is out. He_________ left for home.
A．must haveB．must have beenC．should haveD．should have been
A

試題分析：句意：辦公室的燈滅了，他一定已經(jīng)離開回家了。從The light in his office is out.可知是對(duì)過去的肯定的推測(cè)，用must have done“過去一定做了”，should have done“過去本應(yīng)該做而沒有做”，所以選A。
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