I'm too tired , I can't go any f___.

问题描述:

I'm too tired , I can't go any f___.
补全空中的单词,第一个字母已经给出
到底是 far farther 还是 further?

farther.
farther与further都是far的比较级,但farther多指距离的远近,further多指程度上的深浅(如further one's study)