◎ 题干
Every means     , but none proved      .
A.have tried; a successB.have been tried; successful
C.has tried; to be successfulD.has been tried; successful
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Every means, but none proved.A.have tried; a successB.have been tried; successful C.has tried; to be successfulD.has been tried; successful…”主要考查了你对  【主谓一致】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。