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
Both his parents look sad.Maybe,they___what'shappened to him.
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!
A.knew B.have known C.have been know D.had known
实在感激不尽!
英语人气：806 ℃时间：2019-10-19 18:17:08
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