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单选题
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

参考答案

参考解析
解析：
1999到2003为一阶段时间，故应提前介词during，which time代替这一阶段。
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