请问哪位朋友知道:如果不想入美国籍,只想保持婚姻绿卡,是要求每年至少半年在美国,还是至少半年登陆美国一次?
-The green card is for you to live in US permanently, not for you to use it as border-crossing card, so it you go back and forth between China and US too often, your green card probably will be cancelled.