should US citizen use US passport or HKID card in/out HK? - Yahoo!知識+
Last year I used my HKID card leaving HK because I was not US citizen (only had a green-card). Recently, I just got my US citizenship and US passport in USA. If I go back HK, can I use HKID card to in/out HK? If yes, will US immigration dept doubt why I d...
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