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				29．She was writing a letter    someone  knocked at the door．  A．but           B．because        C．when           D．a(chǎn)nd			【查看更多】
			


		
           
          


		
          
		
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          She was writing a letter       someone knocked at the door．
            
          A．but          B．because          C．when               D．a(chǎn)nd
          

			
          
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