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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】

試題分析:考查動詞的時態(tài)和語態(tài)。句意:每種方法都已經(jīng)嘗試過了,但沒有一個是成功的。根據(jù)but none proves successful可知已經(jīng)嘗試過了,try與means之間是動賓關(guān)系,故選D項(xiàng)。

考點(diǎn) : 考查動詞的時態(tài)和語態(tài)

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