Every possible means ______ to prevent the air pollution, but the sky is still not clear.A．has been usedB．have been usedC．is usedD．are used-高中英语-n多题

◎ 题干

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

A．has been used　

B．have been used

C．is used　

D．are used

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◎ 解析

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◎ 知识点

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