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 |
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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 time | D．by that time |
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