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    【题目】The zoo keeper is worried because the number of visitors _______ smaller and smaller.
    A.become
    B.are becoming
    C.is becoming
    D.have became

    【答案】C
    【解析】句意：动物管理员变得很焦急，因为游客人数正变得越来越少。the number of+名词作主语，后面的谓语动词要用单数，A，B三项的主语都得是复数；数字的变化和管理员的焦急是同时进行的，所以要用现在进行时．故选C。

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