父母2019年底回中國，因為covid難以過來也不太願意現在過來。綠卡4月過期。請問有什麽辦法renew或延期嗎？如果過期了，將來來美國是不是得辦簽證？是不是簽證很容易被拒？
-Do your parents have the reentry permit? If no, their green cards have been void becuase their stay in China has been more than one year and thus, they cannot use it to reenter US. They may just abandon the green card and then, apply for the B2 visa to enter US in the future.
