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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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