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？

of which=where

in and out在此处应该只是副词词组（in并非只有介词功能，out更不一定），和walk搭配，有“进进出出”的意思。除非将题干改为walk into and out of，into和of才是十足的介词，才要选where