我从事这工作已经7年了的翻译：I have engaged in this work has been for 7 years 什么意思？中文翻译英文，英文翻译中文，怎么说？

青云英语翻译

I am engaged in this work has been 7 years

I have engaged in this work has been for 7 years

I was engaged in this work already 7 years

I have been engaged in this work has been 7 years

I have engaged in this work has been for 7 years