She could tell at first glance to...

问题描述:

She could tell at first glance to...
She could tell at first glance to which class a man beloned.这句话中的那个to让我感到费解,为什么要用to呢,这是个什么从句?

这是一个定语从句,从 “which" 往后.
而楼主所提到的”to"是和belong组成的短语,"belong to“的意思是:”属于“.
定语从句的引导词是”which“介词提前,”to which"可以用“where”代替,在定语从句中作状语.