請教8老師持綠卡回國問題。本人在國內照顧病重的父親3個月,前天剛剛返回美國。 問題1,我是否必須在美居住6個月後才能再回國內? -Not have to, but if you will stay in China for a longer time or go forth and back between US and China, you had better apply for reentry permit.