问题补充：
英语小小问题Mark was a student at this university from 1990 to 1995,during which time he studied hard.为什么during后面用which?After the war,a new school building was put up where there had once been a theatre.这里
答案：
He studied hard during the time (from 1990 to 1995).
在从句里面,1990 to 1995是做during的宾语啊
当然用which
这个there是there be句型（这个是过去完成时的There be）,当然不能去掉
不可以变成你这样
======以下答案可供参考======
供参考答案1:
这里的which是代替上文的from 1990 to 1995的一个定语从句，引导词为which。这里的where也是一个定语从句的引导词，在定语从句中做主语要放在定语从句的开头。你可以多看看有关此类的定语从句。这是我的看法，我不能保证全对！
供参考答案2:
which指代1990 to 1995，during介词后用名词
解释学校建成的地方是哪 是原先的剧院
不可以不可以
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