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          I became a student ten years            . I have been a student             1996. I have studied here             
          about 10 years. 

          A. ago, since, for 
          B. ago, for, since, 
          C. ago, before, for 
          D. ago, in, after 
          			
          

			
			
			
		
          



							
          
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          I became a student ten years            . I have been a student             1996. I have studied here             
          about 10 years. 
          

          [     ]
          A. ago, since, for 
          B. ago, for, since, 
          C. ago, before, for 
          D. ago, in, after 
          

			
          
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