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          Some of the students are not sure ___ spelling the word, while others are not sure ___ the use of some grammatical rules.
          A．of… aboutB．a(chǎn)bout…toC．of…toD．for….of
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
          be sure of意思是：確信。be sure about意思是：對…有把握。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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