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

试题分析:句意:办公室的灯灭了,他一定已经离开回家了。从The light in his office is out.可知是对过去的肯定的推测,用must have done“过去一定做了”,should have done“过去本应该做而没有做”,所以选A。
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