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Why ______ your brother often _______ the museum ?
A. do , visit B. do, visits C. does, visit

試題分析：句意:你的哥哥為什么經常參觀這家博物館? 在一般現在時態中，謂語動詞若為行為動詞，其一般疑問句要借助于do和does來構成，同時行為動詞變為原形。本句中主語your brother是單數第三人稱，故助動詞用does，選C。
點評：一般現在時態中，當主語是單數第三人稱時，謂語動詞用單數形式，其他人稱，謂語動詞用原形。若謂語動詞若為行為動詞，其否定式和疑問句要借助于助動詞do和does來構成，并且將行為動詞還原為動詞原形。當主語是單數第三人稱時，助動詞用does。

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