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          Helen has two sisters and a brother．Her brother is working，but _______ her sisters are still at school．
            
          A．neither         B．either         C．all         D．both
            
            
         
        
         			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				  
            
          1、D
            
            				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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          Helen has two sisters and a brother．Her brother is working，but _______ her sisters are still at school．
            
          A．neither         B．either         C．a(chǎn)ll         D．both
          

			
          
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