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          Your son has kept _________ for two hours. You’d better ask him to have a rest.
          A．studyB．studiedC．to studyD． studying
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          D
          keep doing sth表示不斷地做某事，故本題選D。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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