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				 Mr Smith became a teacher in 1989. He    for twenty years by next summer. A. will  teach             B. would have taught C. has  been teaching         D. will have been teaching			【查看更多】
			


		
           
          


		
          
		
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          Mr Smith became a teacher in 1989. He            for twenty years by next summer.
            A. will teach                          B. would have taught
            C. has been teaching               D. will have been teaching
          

			
          
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