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

来源: 于 2012-03-30 15:37:33 [旧帖] [给我悄悄话] 本文已被阅读：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.