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但网页上没有指明说向USCIS的哪个地址联络要求OPT-OUT,8老师有可能会有地址吗?谢谢!!

-If you are physically present in US, you need to mail the request to the USCIS addess where the I-130 is located (you can find the address on the I-130 aprpoval notice or receipt).

If you are in China, you need to send the request to the USCIS Field Office in Beijing, China. See:

https://www.uscis.gov/about-us/contact-us/contact-us-uscis-beijing-field-office

https://www.uscis.gov/about-us/find-uscis-office/international-offices/china-uscis-beijing-field-office

or in Guangzhou:

http://guangzhou.usembassy-china.org.cn/cis.html