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          If you really have to leave during the meeting, you’d better leave _________ the back door.
          A．forB．by
          C．a(chǎn)crossD．out
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          B

          B。by在此表示“通過(guò)”，如：The thief slipped out by the back door. 那個(gè)賊偷偷(從后門(mén))溜出去了。這樣用的by用through用法相同，有時(shí)可互換，如：The burglar got into the house by / through the bedroom window. 竊賊是從臥室的窗戶潛入這所房子的。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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