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          —Tom, you look tired this morning. What’s wrong?
          —I was so busy that I didn’t go to bed________12 o’clock last night.
          A．untilB．whenC．thoughD．unless
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          本題符合not···until的結(jié)構(gòu)，表示直到···才，故選答案為A
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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