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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：除非你能睡個好覺，否則一兩個晚上后你就會失去集中注意力、計劃和保持活力的能力。
    本題考查狀語從句。Once一旦，Unless除非，If如果，When當……時候。結合句意，睡不好覺，你就會失去集中注意力的能力。故選B。
    				
    
							
    
			
    
			
    
			
			
    
		
    
	
    

		
    

		





			
    
		
    
		
				
    
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