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．a(chǎn)re 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．a(chǎn)re used     C．has been used                  D．have been used

 

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