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(Not knew )what was wrong with him ANot knew Bᙦ

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(Not knew )what was wrong with him ANot knew BNot known CNot knowing
(Not knew )what was wrong with him
ANot knew BNot known CNot knowing DNot to know
为什么选a
因为没有上下文,所以只可能是以前不知道但现在知道了.所以以前不知道就用过去时Not knew,而且从句是过去时,主句也要用过去时