我从1990 年 一至到1995 年在ABC 公司当 MIS 执行员.Translate it into English
Please provide a better answer and explain in mandarin.
What are the differences among these sentences as below?
1)I had been working in ABC company as a MIS executive from year 1990 to year 1995.
2)I worked in ABC company as a MIS executive from year 1990 to year 1995.
3)I worked in ABC company as MIS executive from year 1990 to year 1995.