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          -Has Tommy finished his homework yet??
            
          -I have no idea; he ____ it this morning.
            
          　 A. was doing 　 B. had been doing  C. has done 　 D. did
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
             
          解析:
               
          表示今天上午一直在做作業(yè)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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