练习册

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    They keep connected with each other the telephone. 【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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