他已经在这一个公司辞职.Translate it into English.

题目

他已经在这一个公司辞职.Translate it into English.
Please provide a better answer and explain in mandarin.
Which is correct as below?
What is the differences among (1) ,(2),and (3)?
1)he has resigned from this company.
2)he resigned from this company.
3)he resigned from this company last week.

答案

1)he has resigned from this company.-------强调到目前为止的结果.
2)he resigned from this company.-----回忆过去的事情,与现今没有关系.
3)he resigned from this company last week.-------强调动作发生的时间.