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!

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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!

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!
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!

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!
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

B.have known

B他父母看起来都很悲伤,也许,他们知道他发生什么事了

B.have known

B 用现在完成时

D