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 timeD by that time
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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 timeD by that time