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    精英家教网 > 高中英语 > 题目详情
    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 triedD．have been tried
    C

    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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