【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。可能他們已經(jīng)知道他發(fā)生了什么。

考查動(dòng)詞時(shí)態(tài)。will know將會(huì)知道，一般將來時(shí)；know知道，一般現(xiàn)在時(shí)；have known已經(jīng)知道，現(xiàn)在完成時(shí)；are knowing正在知道，現(xiàn)在進(jìn)行時(shí)。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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