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题文

—What did you say to your sister? I saw her crying in the room.
— It _________ my fault. I just said hello to her when I met her, nothing else.

A.must have been B.can’t have been
C.oughtn’t to be D.should have been
科目 英语   题型 单选题   难度 中等
知识点: 情态动词
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