【题目】The room is so clean. He ____have cleaned it yesterday evening.
A. willB. need
C. canD. must
在线课程【答案】D
【解析】
考查情态动词表推测。句意：房间如此干净，他一定是昨天晚上打扫过了。must have done表示对过去发生的事情最有把握的猜测，意思是“一定（做过）”，故D项正确。
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