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          ______I used to go mountain—climbing every summer .
          A．a(chǎn)t a timeB．a(chǎn)t one timeC．At timesD．At the same time
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B
          at a time 一次；at one time 曾經(jīng)
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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