题目是
The office building ________ people walk in and out is the tallest buliding in
the world.
解答是where
想请问为什么不是which?
in and out 介系词还存在句子中的情况下不是应该写which吗？

walk out of the building

本句的in and out是副词，不是介系词。

啊啊啊！谢谢 突破我的盲点了！！！！