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我父母2018年2月得到綠卡，2018年4月離境回的中國，我父親身體不好所以他們一直呆在中國。請問他們必須什麽時候回美國才能保持綠卡？要在美國呆多久？
-They must return to US before April. Otherwise, if they stay in China for > one year, their green card will be void automatically unless they can prove something out of control to prevent them to return on time (this is very complicate).