题目内容：

she was not the woman__she was before.为什么不选c a what b that c who d as

优质解答

有个规则：先行词在主句中作表语,并且关系词在从句中作表语时,这时关系词用 that .
题目中先行词woman在主句中作表语,而选项中的关系词在定语从句中又作表语.