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          While   he ________ his homework , his mother came in.
          A．doesB．didC．was doingD．do
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          while 引導(dǎo)的時間狀語從句，從句往往用進行時態(tài)，故選C
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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