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				31．Cars  produce a lot of waste gas every day and pollute the air     ,  air pollution has become a serious problem．A．As a result       B．In the  way      C．No longer       D．At the  end			【查看更多】
			


		
           
          


		
          
		
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          Cars produce a lot of waste gas every day and pollute the air        , air pollution has become a serious problem．
            
          A．As a result            B．In the way         C．No longer             D．At the end
          

			
          
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