20.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 查看更多

 

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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

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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

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

A.is usedB.are usedC.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

 

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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

 

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