how to keep green card?

来源: 于 2004-05-18 23:34:29 [旧帖] [给我悄悄话] 本文已被阅读：次

Folks,

I got a job in London.
How can I keep my green card?
some people say I need to stay
at least 6 months/per year in the US;
someone says that I only need to travel
to the US once a year?

Please advise me... thanks.