回复:Life is not fair
for your case (I-485 4yrs, I assume your PD is current), then wom is very effective. see
http://www.photobaobei.com/greencard/wom.php
I have a few friends with NC over 4 yrs, they filed wom and got I-485 approived without getting MTD(motion to dismiss from US attorney).
just waiting will not help it at all.