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11.Why and how he came here ______  yet.(  )
A.is not knownB.are not known
C.has not knownD.have not been known

分析 他为什么和怎么来到这儿还不知道.

解答 答案:A 考查主谓一致.Why and how he came here是主语从句,作主语时,谓语动词用单数,排除B、D项;只能从A、C项中选择,而know是及物动词,要用被动语态,排除C项,只有A项正确.

点评 考查主谓一致,了解各种主谓一致的表达形式,准确地翻译句子,然后根据题意选择最符合题意的答案.

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