هل هناك خطأ فى هذه الجملة........؟؟

[omry3]

.He.................. on that project for two years, and not finished.
a- worked
b- am working
c- have been working
d- have worked

[Ismail Elsaghir]

I think the right answer is , He has been working because he is still working "

[omry3]

انا كنت اقصد كدة على اعتبار ان مفيش has فى الاختيارات