There are two spare rooms in this building,neither of _____ has been provid

题目

There are two spare rooms in this building,neither of _____ has been provid
A.it B.which C.them D.this
答案是什么,为什么

答案

C.
Neither of them,没有一个
原句意思为这个建筑里有两个房间是剩余的,但没有一个是被提供出来的.