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 triedD．have been tried
C

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(dòng)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(dòng)詞時(shí)態(tài)和語態(tài)及主謂一致的用法。
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