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

A．knewB．have known
C．must knowD．will know

B

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生了什么。Ａ. knew知道（過去） ，Ｂ. have known（已經）知道了，Ｃ. must know 一定知道，Ｄ.will know將會知道。據句意have known表示known發生在過去對現在造成的影響是Both his parents look sad .，句子要用現在完成時態，故選B。
考點：考查現在完成時態。

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