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          Mary _________ as a volunteer teacher for 10
years.
          


          A.
works        B. will
work       C.
worked        D. has worked
          


           
          


           
          			
          


			
          

		
          
		
		
	
          
		
          
			
          
				
          
				【答案】






          D
          


          【解析】略
          


           
          				
          
							
          
			
          
			
          
			
			
          
		
          
	
          

		
          

		





			
          
		
          
		
				
          
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