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             ---     Bob doing homework?
          ---No, he isn’t. He is        a letter.
          A．Does, writesB．Is, writes C．Does, writingD．Is, writing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          這是一個(gè)現(xiàn)在進(jìn)行時(shí)的一般疑問句，所以應(yīng)用is來提問,write的現(xiàn)在進(jìn)行時(shí)是writing故選D
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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