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          By the time I arrived at the hall, the meeting         for half an hour．
            
          A．began                                                        B．had began 
            
          C．had been on                                               D．has been on
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、C
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          By the time I arrived at the hall, the meeting         for half an hour．
            
          A．began                                                        B．had began 
            
          C．had been on                                               D．has been on
          

			
          
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