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				27．―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			【查看更多】
			


		
           
          


		
          
		
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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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