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          The teacher tells his students to read the novel over and over again until they ______ it.
            
           　 A. understand 　      B. understood
            
           　 C. have understood 　 D. have been understood
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				
          A
             
          解析:
               
           until 引導(dǎo)的是狀語(yǔ)從句，注意時(shí)態(tài)和前句的統(tǒng)一。
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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