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           He was about to leave the office for home _______someone knocked the door and asked for some help.
          A．untilB．whileC．a(chǎn)sD．when
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D

          試題分析:句意：他正要離開辦公室回家這時有人敲門求助。固定句型：be about to do …..when 正要做某事……這時，選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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