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           -- ________  your homework yet?
          -- Not yet. I _______ it.
          A．Have you done; am doingB．Did you do; am doing
          C．Have you done; didD．Did you do; did
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A               
                       
          試題分析：考查動詞時態(tài)。句意 你做完作業(yè)了嗎？沒有，我正在做。haven't done 強調還沒有做這個概念， 而 am doing 是說馬上要做，口語中常說的（這時現(xiàn)在進行時表將來的概念，例如I'm coming. I'm going to school），所以選A項。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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