8老师及各位大侠：父母以前有绿卡，十年前回国未再来美，也未填表放弃绿卡。现在八十有余，想他们来美，不知应该怎么办？我是美国公民。
申请B2有可能吗？
还是得重新申请绿卡？
或是有其他什么办法？
-Your parents need to abandon their green card and then, they can apply for the B2 visa to visit you. Although their green cards are void due to long term stay in China, the immigration system still record them as green card holders. So, they need to file I-407 to abandon their green card to clear the record.
先谢过！！！
