请问8老师：老公原来的国籍是加拿大，他最近入美国籍后申请了美国护照。现在他需要回中国出差。他能不能用原来加拿大护照里的10年中国签证入境中国？
-I think so. If he wants to enter/depart China as a US citizen, he needs to show both his Canadain passport (which has the visa) and US passport to the Chinese Customs officer.
还是他必须用他的美国护照重新申请中国签证？谢谢！
