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我有一親戚， 拿綠卡有四年了，因生意在國內，過去四年每半年來一次住一兩個月。上次入關時，海關人員告述他下次要住半年，否則取消綠卡。這次過來住了兩個月，國內有事需要臨時回去兩星期。他再入關時會有問題嗎？謝謝
-Probably he will have trouble to reenter US because the IO has given him warning.  He needs to apply for reentry permit to travel to China.