The doctor tried their best to save the old man"s life,_______failed.

问题描述:

The doctor tried their best to save the old man"s life,_______failed.
A:or B:so C:but D:because

Cbut 但是,表转折
翻译是 这个医生尽了最大努力挽救这个老人的生命,但是失败了