-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 题目和参考答案——青夏教育精英家教网—

题目内容

—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

【解析】

试题分析：考查情态动词。句意：你知道昨晚谁在敲门吗，邮递员吗？不可能是，那里才五点钟。根据It was only 5 o’clock可知表示对过去的否定推测，故选B项。

考点：考查情态动词

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