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