1st time use GC, shall I hand in I-94?

來源: 於 2012-03-30 15:37:33 [舊帖] [給我悄悄話] 本文已被閱讀：次

I just got GC, plan to go to China next month. Do I need to hand in I-94 when I leave U.S.?
Thank you very much.