would be getting better results or would get better results

[chance22]

Had you been more careful on the maths exam, you ______ much better results now.
A. would be getting B. could have got C. must get D. would get
The key to this ex is A; then I wonder what's the difference between A and D? Can't I use D?
Could you help explain it for me? Thank you

 

[5jj]

None of the answers seems very likely to me. I would have expected "... you would/could gave got better marks/ a better result [STRIKE]now[/STRIKE].

 

[chance22]

None of the answers seems very likely to me. I would have expected "... you would/could gave got better marks/ a better result [STRIKE]now[/STRIKE].

OK, I got it. Thank you.