我现在是F1留学签证，三年之后签证到期，（加上opt的时间，我不确定在绿卡发下来之前我的身份是否一直有效）我现在想申请F2B移民，我的i120表格里的申请大使馆应该填国内还是国外呀，还是国内外都填（不确定到时候需不需要回国重新办签证）
-Only fill the US Consulate in Guangzhou, China.
。如果我一直不离开美国我还需不需要重新办签证？
我可以在美国境内拿到绿卡么？
-Yes. If you still have a legal status when the prority date becomes current,, you still can file I-485 within US to get the green card even if you plan to get the immigrant visa in China by filling the US Consulate in Guangzhou in the I-130 now..
