Question

it was a new-type school, ___ had never before existed in the history.

A such B such as C such as it D such it

答案是B 不能理解为什么可以用such as 在这里..

Answer 1

这是一所新型学校， 一种史上从不曾有过的学校
such 在这里作代词用， 指“这样的学校” 作 school 的同位语， 后面as 是关系代词引导定语从句修饰 such 的， 并在从句中做主语。
语言点：
1. such 代词， 做同位语
2. 当先行词是such, the same, 或者先行词被such , the same 修饰时， 后常接 as 引导的定语从句
如： This is such a difficult problem as I can't work out.
I have the same opinion as you ( have).

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Answer 2

猜想--As是类似于Which吧，以保证句子结构的完整性，Such代指前面的内容。不过其实我也有点困惑