Bothhisparentslooksad.Maybe,they___what'shappenedtohim.A.knewB.haveknownC.havebeenknowD.hadknown
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题目内容：
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!
优质解答
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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