how to keep my Greencard?

来源: LDLD 于 2010-04-22 09:39:30 [] [旧帖] [给我悄悄话] 阅读数 : (141 bytes)

If I have to stay in USA for one year and in China for another one year (in the next 10 years total), how to keep my Greencard valid? Thanks!

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