摘要： 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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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
查看习题详情和答案>>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
查看习题详情和答案>>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 |