【題目】The room is so clean. He ____have cleaned it yesterday evening.

A. willB. need

C. canD. must

【答案】D

【解析】

考查情態(tài)動詞表推測。句意：房間如此干凈，他一定是昨天晚上打掃過了。must have done表示對過去發(fā)生的事情最有把握的猜測，意思是“一定（做過）”，故D項正確。

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