[文法] to which的時機或用法

[wowhanhow (我很好)]

She corresponded with current students and got a virtual feel for the schools

to which she'd been accepted.

想問一下 其實這個句子我是看得懂

但從以前到現在就不是很了解to which出現的時機

請問是什麼時候和狀況才要加上這個介詞呢???

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→ zofloya:she'd been accepted "to" the schools.