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Every means     , but none proved      .
A.have tried; a successB.have been tried; successful
C.has tried; to be successfulD.has been tried; successful
D

试题分析:考查主谓一致:means是单复数同形的名词,单复数取决于修饰词,这句话means用every修饰,说明是单数,谓语用单数,而且means和try是被动关系,用has been tried,第二空的prove是连系动词,后面接形容词做表语。句意:每种办法都被尝试过了,但没有一个证明是成功的。选D。
点评:主谓一致的考点较多,要在理解的基础上加以记忆,多练习加以巩固。这里的单复数同形的单词一定要看修饰词来判断。
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