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8老師，您好。我父母去年在廣州通過了綠卡麵試，要求今年4月份前來美國,但是他們來美國的飛機由於新冠的原因被取消，來不了，請問我應該怎麽給他們辦理延期，謝謝。

-Read this site for more contact information on phone#, email contact, etc.:

https://china.usembassy-china.org.cn/visas/immigrant-visas/contact-us/

You may email and also call them.