We are very surprised to find that he has so many books that they have piled up to the _______ of his study.
问题描述：
We are very surprised to find that he has so many books that they have piled up to the _______ of his study.
A. topB. tip
C. ceilingD. roof
请辨析一下,这四个词有什么区别,最好能详细举例
答
C
top是任何东西的最顶端
tip是尖尖的头
ceiling是天花板（屋子里面的）
roof是屋顶（屋子外面的）
在这里,study作‘书房’