Every possible means______, but none proved successful.A、have been triedB、has b

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问题 Every possible means______, but none proved successful.

选项 A、have been tried
B、has been tried
C、have being tried
D、has being tried

答案 B

解析这句话的意思是说，所有可能的方法都已经试过了，没有成功的。means在这里是名词，表示“方法，方式”，所以正确项为(B)。

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Everypossiblemeans______,butnoneprovedsuccessful.A、havebeentriedB、hasb