—Do you know who knocked at our door last night, the postman? —It _______ him. It was only 5 o’clock...
2022-11-15 20:15:54 156次 2014-2015学年四川成都树德协进中学高二10月阶段性考试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
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
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