My hometown used to be a small place compered with ______ it is now横线处填what,为什么不能填how

问题描述:

My hometown used to be a small place compered with ______ it is now
横线处填what,为什么不能填how

what 做is的表语,引导的是宾语从句

what代指前面的hometown
how不能代指名词