两个都可以
what school
什么学校
which school
哪一所学校
I do not know _what_school he is in
He's in college
I do not know _which_school he is in
He's in SuperCool school. / he's in the best school in our city
which
which是哪一个 后面要有名词 what是什么 直接充当 which ＋名词的功能了
which 哪一所学校，而非什么学校.
应该是which
Which
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