Mark was a student at this university from 1999 to 2003,____he studied very hard,
人气：325 ℃ 时间：2020-04-05 06:53:48
解答
when.答案为when或during which time,我不明白为什么不能用during which,which代替1999 to 2003不是吗？which是不能直接指代时间的，必须是which time
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