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      What ____ you ______ at this time yesterday? 
      A．did ; do B．is; doing C．were; doingD．a(chǎn)re ; doing
      			
      


			
      

		
      
		
		
	
      
		
      
			
      
				
      
				
      C
      at this time yesterday是過(guò)去時(shí)的顯性標(biāo)志，強(qiáng)調(diào)當(dāng)時(shí)正在做什么。故選C.
      翻譯為“昨天的這個(gè)時(shí)間你們正在做什么？”
      				
      
							
      
			
      
			
      
			
			
      
		
      
	
      

		
      

		





			
      
		
      
		
				
      
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