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          I_______ my homework at nine o'clock last Sunday morning.
          A. am doing     B. was doing                  C. do
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B 
          考查時(shí)態(tài)。由句中的時(shí)間狀語(yǔ)可以判斷句中應(yīng)用過(guò)去進(jìn)行時(shí)
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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