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

发布时间：2020-08-16 11:25:23


Every possible means     to prevent the air pollution, but the sky is still not clear.
A. are being used
B. have been used
C. has been used
D. had been used

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A. are being used
B. have been used
(答案→)C. has been used
D. had been used
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