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           —Fire is very useful to human!
          


             —Yes, especially in winter a
fire _____________warm.
          


             A. used to keep                        B.
can be used to keep   
          


          C. is used to
keeping               
D. was used to keeping
          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          B
          


          【解析】略
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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