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				 -Look! How dirty the river is!   -But it          clear before a factory was set up nearby.   A. used to be    B. will be   C. has been   D. is			【查看更多】
			


		
           
          


		
          
		
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          －Look! How dirty the river is!
          

          －But it ________ clear before a
factory was set up nearby.
          

          A. used
to be  B. will be　　    C.
has been　　 D.
is  
          

           
          

          

			
          
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