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          —What were you doing when the UFO arrived?— I         with my dog on the street.
          A．walked B．was walkingC．is walkingD．have walked
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          考察時(shí)態(tài)，句意：當(dāng)這個(gè)飛碟到達(dá)時(shí)，你正在做什么？結(jié)合語境可知下文應(yīng)該用過去進(jìn)行時(shí)回答，故選B
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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