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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.are tried 
C.has been tried D.have been tried 

C

解析试题分析:句意:尽管阻止河流污染的每一种可能的办法都已采用了,但我家乡的河流仍没能恢复到以前的美丽。means单复数同形,但句中means前有every修饰,故谓语动词要用单数,由句意可知应用现在完成时。
考点: 考查动词时态和语态及主谓一致的用法。

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