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    The zoo keepers is worried because the number of visitors smaller and smaller. A. become B. became C. is becoming D. have become 【查看更多】

     

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    The zoo keepers is worried because the number of visitors  __        smaller

    and smaller.

    A. become    B. became     C. is becoming   D. have become

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    The zoo keepers is worried because the number of visitors  __       smaller

    and smaller.

    A．become

    B．became

    C．is becoming

    D．have become

     

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    The zoo keepers is worried because the number of visitors  __       smaller
    and smaller.

    A．becomeB．becameC．is becomingD．have become

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