同时请教, 如果要保持绿卡,必须3个月或半年回美国一次吗?

来源: winrainbow 于 2008-04-20 11:28:55 [旧帖] [给我悄悄话] 本文已被阅读：次

有没有别的方法保持绿卡?谢谢.

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