17．I’m ____a diet, since I put ____ weight easily.
      A．in; onB．on; in C．in; inD．on; on
      			
      


			
      

		
      
		
		
	
      
		
      
			
      
				
      
				
      D
      考查介詞的用法。這兩個空是固定短語，on a diet 在節(jié)食，put on weight 增加體重，句意：我在節(jié)食，因為我很容易增加體重。所以選D。
      				
      
							
      
			
      
			
      
			
			
      
		
      
	
      

		
      

		





			
      
		
      
		
				
      
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