8老師 謝謝你在此處的無私奉獻和專業的見解。
-You can not use the US passport any more and actually, your US passport will be taken away after you take the oath on Renunciation of U.S. Nationality. The proof of renunciation will be issued to you immediately at that time. After you give up the US citizenship, you can visit US like any other Chinese citizens to apply for a non-immigration visa. Also, you can apply for green card again if you meet the requirement, but you will never be a US citizen anymore.