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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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