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          — Why does the Lake smell terrible? 
          — Because large quantities of water _____. 

          A. have polluted 
          B. is being polluted 
          C. has been polluted 
          D. have been polluted 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
			請(qǐng)?jiān)谶@里輸入關(guān)鍵詞：
					
					
			
          
			
          
			
          
		
          
	
          
		
		
          
			
          
			
			
		
          



							
          
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