下面我这个英语句子正确吗?关于since 的用法

题目

下面我这个英语句子正确吗?关于since 的用法
Since the terminal was put into use in 2004 ,there is no project quality problems been found so far.
这句英语句子正确吗?

答案

i've known him for approximately one year since he joined IN my research group.(corrected)but i would say,i've known him for about a year since he was in my research group.'approximately' sounds too a...