—Do you know who knocked at our door last night, the postman?

—It _______ him. It was only 5 o’clock.

A. mustn’t B. can’t have been

C. can’t D. mustn’t have been

 

B

【解析】

試題分析：考查情態(tài)動詞。句意：你知道昨晚誰在敲門嗎，郵遞員嗎？不可能是，那里才五點鐘。根據(jù)It was only 5 o’clock可知表示對過去的否定推測，故選B項。

考點：考查情態(tài)動詞

 

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