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          —__________ do I have to change the robot’s batteries? —Every two months.
          A．How longB．How soonC．How oftenD．How many
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          C
          本題的回答語意思為每兩個(gè)月，表示的是頻率，對(duì)此提問應(yīng)該用how often，故選C,how long對(duì)長度提問，how soon對(duì)多久以后提問，how many對(duì)可數(shù)名詞數(shù)量提問。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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