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          They have been skating __________.
          A．for three hoursB．since three hours ago 
          C．three hours agoD．since three hours
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          for 一段時(shí)間，為現(xiàn)在完成時(shí)態(tài)的時(shí)間標(biāo)志，故選答案為A
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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