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				       such heavy pollution already, it may now be too late to clean up the river.     A. Having suffered  B. Suffering     C. To suffer     D. Suffered			【查看更多】
			


		
     
    


		
    
		
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    ________ such heavy pollution already, it may now be too late to clean up the river．

    1. A.
      Having suffered
    2. B.
      Suffering
    3. C.
      To suffer
    4. D.
      Suffered
    

			
    
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    _____such heavy pollution already, it may now be too late to clean up the river. 
      
    A.  Having suffered     B. Suffering    C. To suffer     D. Suffered
    

			
    
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    _______ such heavy pollution already, it may now be too late to clean up the river. 
      
    A. Having suffered   B. Suffering  C. To suffer                           D. Suffered
    

			
    
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    ________ such heavy pollution already, it may now be too late to clean up the river.
      
    A. Having suffered　　 B. Suffering
      
    C. To suffer　　　 　D. Suffered
        
     
    

			
    
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    ________ such heavy pollution already, it may now be too late to clean up the river. 
      
    A. Having suffered   B. Suffering 　　　  C. To suffer 　　　  D. Suffered 
        
     
    

			
    
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