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Mark was a student at the university from 1999 to 2003, he s05.studied very hard

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Mark was a student at the university from 1999 to 2003, he s05.studied very hard

Mark was a student at the university  from 1999 to 2003,________ he s05,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