问题描述：
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 where there had once been a theatre.there有什么作用,去掉可不可以?此句可不可以改为这样After the war,a new school building was put up there where had once been a theatre.
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 where there had once been a theatre.there有什么作用,去掉可不可以?此句可不可以改为这样After the war,a new school building was put up there where had once been a theatre.
问题解答：
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