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          21．Miss Li ________ as a biology teacher for fifteen years in
our school, and now she is Party secretary of our city.
          


          A. works                            B.
worked                         C.
had worked                 D.
has worked
          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          B
          


          【解析】略
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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