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    Every means , but none proved . A. have tried; successful B. has been tried; successful C. has tried; to be successfully D. have been tried; successfully 【查看更多】

     

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    Every means _________, but none proved __________.

    A. have tried; a success                             B. have been tried; successful

    C. has tried; to be successful                      D. has been tried; successful

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     Every means _________, but none proved __________.

    A. have tried; a success                                B. have been tried; successful

    C. has tried; to be successful                        D. has been tried; successful

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    Every means     , but none proved      .

    A．have tried; a success                     B．have been tried; successful

    C．has tried; to be successful                 D．has been tried; successful

     

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