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          — Could you please do some shopping for me, Mary?
          — Sorry, I ______ my homework.         
          A．doB．a(chǎn)m doingC．have doneD．was doing
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          當(dāng)別人請你做某事的時候，我們表示拒絕，應(yīng)該是正在做或?qū)⒁鰟e的事，可用進(jìn)行時態(tài)的結(jié)構(gòu)來表示，故本題選B。意思為我正在做作業(yè)。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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