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—Did Mary come to the party? —I don't know.She__while I was out.A.might have come B.might come 为什么不能选B

题目详情
—Did Mary come to the party? —I don't know.She__while I was out.
A.might have come B.might come
为什么不能选B
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答案和解析
对过去进行推测,用might have gone