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英语
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Both his parents look sad.Maybe,they___what'shappened to him.
A.knew B.have known C.have been know D.had known
实在感激不尽!
人气：472 ℃ 时间：2019-10-19 18:17:08
解答
B 现在完成时
他的父母都很难过 很可能已经知道发生了什么
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