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Every possible means ______, but none proves successful.

A. has tried B. have been tried

C. is being tried D. has been tried

D

【解析】

试题分析:考查动词的时态和语态。句意:每种方法都已经尝试过了,但没有一个是成功的。根据but none proves successful可知已经尝试过了,try与means之间是动宾关系,故选D项。

考点 : 考查动词的时态和语态

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