为什么用since?my bother studied at the high school since he joined the army

来源：学生作业帮助网 编辑：作业帮 时间：2024/06/09 17:51:02

为什么用since?
my bother studied at the high school since he joined the army

我的哥哥高中毕业后就去参军了

自从，自什么之后