【題目】Both his parents look sad. Maybe they _________ what's happened to him.

A.will knowB.knowC.have knownD.are knowing

【答案】C

【解析】

句意：他的父母親看起來都很難過�？赡芩麄円呀�(jīng)知道他發(fā)生了什么。

考查動詞時態(tài)。will know將會知道，一般將來時；know知道，一般現(xiàn)在時；have known已經(jīng)知道，現(xiàn)在完成時；are knowing正在知道，現(xiàn)在進行時。根據(jù)“Both his parents look sad.”可知是已經(jīng)知道他發(fā)生的事情而產(chǎn)生的影響，故選C。

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