She is no longer the girl---she was before she went to the countryside.

问题描述:

She is no longer the girl---she was before she went to the countryside.
A/ Bwhom Cof whom Dwha

选A.that可以代人而且可以省略.
whom who可以互换但是前面有介词只能用whom.比如c的of whom
whom一般指代宾语,句子中缺少的是表语.
既然没有who选最好就选that了.可省略然后选A怎么判断出是表语从句的?这是一个定语从句,所要选择的代词在从句中充当was 的表语、