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Every possible means to prevent the air pollution, but the sky is still not clea

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Every possible means to prevent the air pollution, but the sky is still not clea

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

 

试题答案

C

标签：airthebutpollutionprevent

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