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          David knocked at the door for nearly half an hour______Mary opened it, unwilling.
          A．whenB．whileC．untilD．before
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析：考查狀語從句中的連詞。句意：David敲門敲了將近半個小時Mary才不情愿地打開。狀語從句中表示“過多久…才…”為before 的用法。選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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