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          ---Has Tom finished his homework?
          ---I don’t know.  But he _________ it the whole morning. 
          A．didB．doesC． was doingD． is doing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          此題重點考查過去進行時的基本用法。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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