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    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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    They use computers to keep the traffic _____ smoothly. 

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

     

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