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          —Have they visited the zoo many times.    
          —______________.   Only once.
          A. Yes, they have         B. No, they haven’t       C. No, they have
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          ：B
          ：此題重點(diǎn)考查現(xiàn)在完成時(shí)的簡略回答，根據(jù)答語可知應(yīng)用否定性回答。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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