回複：回複：F-1filed 485, got EAD. Can I still choose to be F-1

as long as you don't use EAD/AP, you are still an F-1 student with dual status (AOS). But after you use EAD/AP, you can only be AOS.
YOur OPT application might be turned down due to the fact that your I-485 is pending.