8老師,您好。
我這次回美入海關時，出示了綠卡，但是又被叫到一個辦公室問了我本科學的專業，我的電郵和電話。我不知到啥原因我被問這些問題。我能想到唯一一個理由時我去年和今年都回國，但是每次回去都超不過一個月。
-Probably that is not the reason because your visiting China once a year for a very short time (about one month each) is very normal. Technically, the IO has the right to check you like that though they normally do not do it to a green card holder very often. I don't think it is a serious thing. Most likely, it is a random selection of check.
我擔心下次回國回來時是否還會受這種待遇，或者更麻煩？
-Don't think so.
