Every possible means _____ to prevent the pollution,but the

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Every possible means _____ to prevent the pollution,but the sky is still not clear.
A is used B are used C has been used D have been used

答案为C
首先我们看到means（方法）这个词,它是单数和复数的形式一致的.
再看Every possible means,每个可能的方法,那当然是单数了.排斥BD
C已经被使用了,现在完成时态与后面的but结果相对应,即先后关系.
A被使用了.没有上述用法.
翻译：防治污染的每种可能的方式都被使用了,但是天空还是不清澈.

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