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Mark was a student at this university from 1999 to 2003, , he studied very hard

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Mark was a student at this university from 1999 to 2003, , he studied very hard

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

试题答案

A