Every possible means ________ to prevent the air pollution，but the sky is still not very clear.A．were usingB．have used C．has been usedD．was used-高中英语-魔方格

◎ 题干

Every possible means ________ to prevent the air pollution，but the sky is still not very clear.

A．were using	B．have used
C．has been used	D．was used

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◎ 解析

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◎ 知识点

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