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 题目和参考答案——青夏教育精英家教网—

题目内容

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

解析:

略

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