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				27．―Look! How dirty  the river is!  ―It       clean before the  factory was built nearby．A．used to be       B．will be         C．has been        D．is			【查看更多】
			


		
           
          


		
          
		
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          一Look! How dirty the river is!
            
          一It        clean before the factory was built nearby．
            
          A．used to be     B．will be                 C．has been         D．is
          

			
          
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