我已经填好了那个表格.Translate it into English

题目

我已经填好了那个表格.Translate it into English
Please provide a better answer and explain in mandarin.
Which is correct?
1)I have completed filling the form.
2)I completed filling the form.
3)I have filled the form.
4)I finished filling the form.

答案

I have completed filling the form.
现在完成时强调了结果,另外,complete更能表示出使之完善