回复：回复：No. Must apply for it in US.

来源: 于 2013-09-20 15:48:47 [博客] [旧帖] [给我悄悄话] 本文已被阅读：次

So if my parents stay in China over 1 year, when they come back to US, their green card will be 作废，是吗？
-Correct.


他们会在入关时被返回吗？
-It is possible.

还是需要签证？
-Had better give up the green card in a US Consulate in China and then apply for a B2 visa to enter US in this case.