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          _____ environmental damage is done, it does take many years for the ecosystem to recover. 

          A. Even if 
          B. While 
          C. Only if
          D. Once 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          _____ environmental damage is done, it does take many years for the ecosystem to recover. 
          

          [     ]
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				科目：高中英語
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           _____ environmental damage is done does it take many years for the ecosystem to recover.
            
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