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 A,C 该如何判别?

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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 A,C 该如何判别?
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
A,C 该如何判别?

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 A,C 该如何判别?
根据后面说天空依旧不清澈,说明前句的动作已经发生了,用现在完成时的C

c 每种方法都被采用了来防止环境污染 means 表示方法 不可数

从下文but the sky is still not clear “可是天空还是不见明朗”来看， 应该是什么办法都用过了，还是不见效，可见应该用现在完成时。 C

A是一般式，C是现在完成式，根据but the sky is still not clear.可以推出，只能选完成式，意思是：每一种可能能阻止污染的方法都已经用过了。

答案为C
means（方法）这个词，它是单数和复数的形式一致的。
Every possible means，每个可能的方法，谓语动词要用单数
C答案说明已经被使用了，现在完成时的被动语态与后面的but结果相对应，即先后关系。
A只是一般现在时的被动语态

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