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
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
A