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          —How long has Sam been skating?
          —He _____ for five hours.

          A. have been skating
          B. has been skating
          C. was skating
          D. has been skated
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				B				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				科目：初中英語
				來源：同步題
				題型：單選題
			
          
									
          —How long has Sam  been skating?
          —He _____ for five hours.
          

          [     ]
          A. have been skating
          B. has been skating
          C. was skating
          D. has been skated
          

			
          
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