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麻烦老师解答:Mark was a student a

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麻烦老师解答:Mark was a student a
Mark was a student at this university from 1999 to  2003,______he studied very hard and was made    
Chairman of the Students' Union.    
[     ]
A.during which time        
B.for which time    
C.during whose time        
D.by that time
麻烦老师解答:Mark was a student a
A