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    Every possible means , but none proves successful. A. has tried B. has been tried C. have been tried D. tried 【查看更多】

     

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    Every possible means______,but none proves successful.
      A.has been tried    B.tried    C.is being tried    D.has tried

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    Every possible means______,but none proves successful.
      A.has been tried    B.tried    C.is being tried    D.has tried

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    Every possible means ____, but none ____ successful．

    A. has tried; has proved     B. tried; proves

    C. has been tried; proves    D. is being tried; is proved

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    Every possible means ________, but none proves successful.

    [　　]

    A．has tried
    B．has been tried
    C．have been tried
    D．tried

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    Every possible means ________, but none proves successful．

    [　　]

    A．has tried

    B．has been tried

    C．have been tried

    D．tried

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