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          His children are well-behaved, _____ those of his sister are naughty.

          A. as 
          B. although
          C. while 
          D. when 
          			
          

			
          
				
          
		
		
	
          
		
          
			
          
				
          
				C				
          
			
          
			
          
				
          
			
          
			
          
				
          
			
          
			
          
				
          
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				科目：高中英語(yǔ)
				來(lái)源：專(zhuān)項(xiàng)題
				題型：單選題
			
          
									
          His children are well-behaved, _____ those of his sister are naughty.
          

          [     ]
          A. as 
          B. although
          C. while 
          D. when 
          

			
          
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