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One possible solution to your problem is that you may go to USCIS overesea office in China to get the issuance of a boarding or transportation letter to come back to US if you was unable to return US before your AP expired due to unforeseen, uncontrollable, and compelling circumstances beyond your control. There are two USCIS oversea offices in China, one is in Beijing US embassy and another is in Guangzhou US Consulate. See the following websites for the contact information.

https://egov.uscis.gov/crisgwi/go?action=offices.detail.overseas&office=Beijing&OfficeLocator.office_type=OS&OfficeLocator.statecode=Bangkok

https://egov.uscis.gov/crisgwi/go?action=offices.detail.overseas&office=Guangzhou&OfficeLocator.office_type=OS&OfficeLocator.statecode=Bangkok