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    34．They use computers to keep the traffic smoothly． A．being run B．run C． to run D．running 【查看更多】

     

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    They use computers to keep the traffic  ____  smoothly．

    A．being run   B．run     C． to run  D．running

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    They use computers to keep the traffic ______ smoothly．

    A．being run          B．run           C．to run           D．running

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    They use computers to keep the traffic ________ smoothly．

    [　　]

    A．being run

    B．run

    C．to run

    D．running

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    They use computers to keep the traffic         smoothly.

    A．being run         B．run         C．to run            D．running

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