there are two roads before us : one which leads to the beach,the other to the park.

题目

there are two roads before us : one which leads to the beach,the other to the park.
which 指什么啊?不是应该为one of which?
这里的of是省略了吗?求解释

答案

which是关系代词,指代前面的one.那个分句是个定语从句.one...the other是固定用语