-回国签F1.
我从递交材料到移民局通知补材料take了4个月。我刚刚把材料补上去,大概需要多长时间移民局会再给消息呢?
-It may take one to three months. But you are legal to stay during your F1 pending. If your F1 application is denied, just go back to China to get a F1 visa and I do not think you have a problem to get it.