如果在美国不保留住房等， 为保证绿卡不被收回，是否回美证是必须的？ 想得到进一步的确认，毕竟申请的时候还是花了些力气，不想轻易失去。
-You had better have the reentry permit if you often go to China and return to US within the two years. The principle is that you need to convince USCIS/CBP that you have the intent to live US permenantly.
-You had better have the reentry permit if you often go to China and return to US within the two years. The principle is that you need to convince USCIS/CBP that you have the intent to live US permenantly.
