3. 以OPT的身份回国的话...
So you want to leave USA and return after filing EB1, not a good idea when
you need to get a F1 visa. you have to tell the truth on DS160 that you have
filed immigration petition and that's a flag for B/F/J visa applicants at a
US consulate in China.
Once you filed EB1, get AP or H1 before leaving USA.