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          What_____you_____at nine yesterday morning?
          A．have, doneB．did, doC．were, doingD．do, do
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          at nine yesterday，表示過(guò)去進(jìn)行時(shí)，故選C
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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