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          By the time I was three, I ______ learning English. I've been learning it for fifteen years.
            
          A．had finished         B．had stopped        C．had started         D．had held on to
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          By the time I was three, I ______ learning English. I've been learning it for fifteen years.
            
          A．had finished         B．had stopped        C．had started         D．had held on to
          

			
          
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