The lake has f___ overnight but the ice is too thin to skate on.开头字母已给出,横线上应填什么?

The lake has f___ overnight but the ice is too thin to skate on.开头字母已给出,横线上应填什么?
The lake has f___ overnight but the ice is too thin to skate on.
开头字母已给出,横线上应填什么?

The lake has f___ overnight but the ice is too thin to skate on.开头字母已给出,横线上应填什么?
Frozen 楼上的时态错了.