While every possible means __________ to prevent the river pollution, the river in my hometown has still not been restored to its past beauty.

A．is tried  B．a(chǎn)re tried 
C．has been tried D．have been tried 

C

解析試題分析：句意：盡管阻止河流污染的每一種可能的辦法都已采用了，但我家鄉(xiāng)的河流仍沒能恢復(fù)到以前的美麗。means單復(fù)數(shù)同形，但句中means前有every修飾，故謂語動詞要用單數(shù)，由句意可知應(yīng)用現(xiàn)在完成時(shí)。
考點(diǎn): 考查動詞時(shí)態(tài)和語態(tài)及主謂一致的用法。

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