7、Every possible means ______ to prevent the air pollution, but the sky is still - 高中英语试题 - 超级试练试题库

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

A．is used

B．are used

C．has been used

D．have been used

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试题【7、Every possible means ______ to prevent the air pollution, but the sky is still】；主要考察你对句式等知识点的理解。[详细]

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