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    The zoo keepers is worried because the number of visitors  __       smaller
    and smaller.
    A．becomeB．becameC．is becomingD．have become
    C
    考查主谓一致。the number of……的数目，谓语动词用单数形式。根据句意用现在进行时。句意：动物管理员担心游客的数量正在变得越来越少。
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