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          ——When         for Beijing?
            
          ——On Sunday．They are now busy preparing for their trip．
            
          A．did they leave                                             B．have they left
            
          C．were they leaving                                        D．are they leaving
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、D
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          ——When         for Beijing?
            
          ——On Sunday．They are now busy preparing for their trip．
            
          A．did they leave                                             B．have they left
            
          C．were they leaving                                        D．a(chǎn)re they leaving
          

			
          
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