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Both his parents look sad . Maybe they __what's happened to him .

A. knew B. have known

C. must know D.will know

【解析】

試題分析：句意：他的父母看起來都傷心。也許他們知道了他發(fā)生了什么。Ａ. knew知道（過去），Ｂ. have known（已經(jīng)）知道了，Ｃ. must know 一定知道，Ｄ.will know將會(huì)知道。據(jù)句意have known表示known發(fā)生在過去對(duì)現(xiàn)在造成的影響是Both his parents look sad .，句子要用現(xiàn)在完成時(shí)態(tài)，故選B。

考點(diǎn)：考查現(xiàn)在完成時(shí)態(tài)。

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