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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
          

          解析試題分析：句意：你完成作業(yè)了嗎?還沒有。我正在做。由yet可知該句用現(xiàn)在完成時態(tài)，結(jié)合情景知后句用現(xiàn)在進行時態(tài)。所以選A。
          考點：考查動詞時態(tài)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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