副词可以作表语，定语从句中从句中，关系副词是不是不仅能作状语，还可以作表语呢？

Question

the place at which he was yesterday is a brothel. at which 可以换做where吗
网上找了道类似的题目
After 3 months of sailing eastwards they arrived in Australia,a place to___ westerners had never been.

A,which
B,that
C,where
D,/
也就是说去掉to，换成where，让where作表语，可以吗？

Answer 1

可以，去掉to, 用关系副词where, 它在句中的成分是表语。