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          —What were you doing this time yesterday? 
           —I _______ some cleaning at home. 
          A．a(chǎn)m doingB．was doingC．doD．did
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          此題考查現(xiàn)在進(jìn)行時(shí)的基本結(jié)構(gòu)。根據(jù)上文，昨天這個(gè)時(shí)候你在正在做什么？可知下文描述的是過去某時(shí)正在進(jìn)行的動(dòng)作，故用過去進(jìn)行時(shí)態(tài)，選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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