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(dòng)詞的時(shí)態(tài)和語(yǔ)態(tài)。句意：每種方法都已經(jīng)嘗試過(guò)了，但沒(méi)有一個(gè)是成功的。根據(jù)but none proves successful可知已經(jīng)嘗試過(guò)了，try與means之間是動(dòng)賓關(guān)系，故選D項(xiàng)。

考點(diǎn) : 考查動(dòng)詞的時(shí)態(tài)和語(yǔ)態(tài)

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