It is 3 years_____he joined the army.
来源：学生作业帮助网 编辑：六六作业网 时间：2025/02/02 22:21:37
Itis3years_____hejoinedthearmy.Itis3years_____hejoinedthearmy.Itis3years_____hejoinedthearmy.since意思
It is 3 years_____he joined the army.
It is 3 years_____he joined the army.
It is 3 years_____he joined the army.
since
意思是他参军已经三年了
原句就有语法错误,如果要用before,前面就应是was.如果要用since,前面就应是has been.所以我认为题目出错了.