I became a student ten years . I have been a student 1996.
I have studied here about 10 years.
A. ago, since, for B. ago ,for ,since C. ago, before, for D ago, in, after
I became a student ten years . I have been a student 1996.
I have studied here about 10 years.
A. ago, since, for B. ago ,for ,since C. ago, before, for D ago, in, after