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"How often_your school sports meeting_?""Once a year."

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"How often_your school sports meeting_?""Once a year."
A.dose,hold B.was,hold C.is,held D.did,hold
求答案并带具体解析.
正解是C .
根据时间状语how often 和答语 once a year 断定句子应该 一般现在时,另外句子主语是 物,your school sports meeting,故用一般现在时被动语态,其表达形式是 is held . 再问: 答案上的确是C 但是我想知道A错在哪里。
再答: A 用的是 does hold 是主动语态。 句子要是这么问就选A How often do you ( 主语是 人) ) hold your school sports meeting ? How often is_your school sports meeting ( 主语是物) held ?