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    Many possible means been tried, but worked. A. have - none B. has - a few C. has - none D. have - a few 【查看更多】

     

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    Many possible means   ___been tried, but   ___worked.
    [     ]
    A. have, none  
    B. has, a few  
    C. has , none  
    D. have , a few

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