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准备给父母申请绿卡，想请问一下在这边申请了AP后回国等绿卡是不是可以？

-Yes, but they have to have the approved AP in hand to travel. Also, don't miss the fingerprinting appointment or any tinerview appointment (if any).

如果可以，要是在国内的时候绿卡批准了，是把卡寄回国内让他们用绿卡入境，还是赶在收到卡前拿AP入境？谢谢

-Had better return to US using AP before the AP expires.