He was admitted to Beijing University,_____his parents had expected.空里面填as 这是定语从句选择题为什么不可以填which?

He was admitted to Beijing University,_____his parents had expected.空里面填as 这是定语从句选择题为什么不可以填which?
He was admitted to Beijing University,_____his parents had expected.空里面填as 这是定语从句选择题
为什么不可以填which?

He was admitted to Beijing University,_____his parents had expected.空里面填as 这是定语从句选择题为什么不可以填which?
是由as引导的非限制性定语从句,表示正如.一样

as这个词比较特别，正如……一样，后面一般会出现几个词，know expect 等，所以一看到这些词，一般都选as 我也不知道为什么。

as