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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 一段時間，為現(xiàn)在完成時態(tài)的時間標(biāo)志，故選答案為A
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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