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          【題目】_______you can sleep well, you will lose the ability to concentrate, plan and stay active after one or two nights.
          A.OnceB.UnlessC.IfD.When
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          【答案】B
          【解析】
          句意：除非你能睡個(gè)好覺，否則一兩個(gè)晚上后你就會(huì)失去集中注意力、計(jì)劃和保持活力的能力。
          本題考查狀語(yǔ)從句。Once一旦，Unless除非，If如果，When當(dāng)……時(shí)候。結(jié)合句意，睡不好覺，你就會(huì)失去集中注意力的能力。故選B。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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