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          If his parents are convinced ____the fact that his son always focuses his mind       his study.  
          A．of; onB．of; atC．by; toD．on; at
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A 
          be convinced of sth “確信；堅(jiān)信某事。”focus one’s mind/attention on sth.將注意力集中于某事物。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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