我收到485 approval letter後，又收到USCIS的郵件要打指紋，是什麽原因？
-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.
這種情況，一般需要多長時間我處理，才收到綠卡？
-Don't know.
