摘要： 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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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 |