who is the woman __ is sweaping the floor over there?A who B / C that Dwhen 为什么不选A.而是选C

问题描述:

who is the woman __ is sweaping the floor over there?A who B / C that Dwhen 为什么不选A.而是选C

当前面的特殊疑问词是who时 关系代词指人时 用that 不用who
固定用法