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          —Look，how happily the boys are swimming in the pool!
            
          —How long ________ they ________?
            
          —For about an hour．
            
          A．have，been swimming                             B．have，swum
            
          C．do，swim                                                 D．have，be swimming
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、A
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          —Look，how happily the boys are swimming in the pool!
            
          —How long ________ they ________?
            
          —For about an hour．
            
          A．have，been swimming                             B．have，swum
            
          C．do，swim                                                 D．have，be swimming
          

			
          
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