how to keep green card valid if move back to China

來源: nmrfun 於 2007-08-19 21:58:04 [] [舊帖] [給我悄悄話] 閱讀數 : (162 bytes)

I feel it is better to have green card as back up, so, how to keep it valid
if I want to go back to China to work?
anyone has a link for the policy? Thanks

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