之所以問第三個問題，是因為有人提過再回中國前最好把niw-140批了。具體有啥用處不記得了，所以問以下。
-You can not file I-485 outside US, but apply for the immigration visa (i.e. visa for green card) in the US Consulate in Guangzhou when the priority date is current. You need to get a job offer from a US employer to be qualified for the immigration visa application.
