我收到485 approval letter后,又收到USCIS的邮件要打指纹,是什么原因?
-It is normal in some cases. Unless you receive a new biometric appointment notice, you do not need to do the fingerprinting. You may visit the USCIS local office to see what happened.
这种情况,一般需要多长时间我处理,才收到绿卡?
-Don't know.