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          Chengdu Metro Line l, _____ into use in October 2010, has made the traffic in this city not so busy. 

          A. to be put 
          B. being put 
          C. having put 
          D. put 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				D				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				相關(guān)習題
			
          	
						
          
			
          
				科目：高中英語
				來源：四川省模擬題
				題型：單選題
			
          
									
          Chengdu Metro Line l, _____ into use in October 2010, has made the traffic in this city not so busy. 
          

          [     ]
          A. to be put 
          B. being put 
          C. having put 
          D. put 
          

			
          
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