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          —When did the boy begin to play the piano?
            
          —      
            
          A．At four                               B．At the age of four years old
            
          C．When he was four                  D．When was he four
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          —When did the boy begin to play the piano?
            
          —      
            
          A．At four                               B．At the age of four years old
            
          C．When he was four                  D．When was he four
          

			
          
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