题目列表(包括答案和解析)
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
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
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 |
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
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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