本人常住在國內， 綠卡即將到期申請renew，請問renew申請提交時以及等待期間需要呆在美國嗎？
-You can file I-90 online when you are present in China, but you need to come back to US to conduct biometrics. If you stay in China for a long perid of time, you need to apply for reentry permit which allows you to stay in China for > one year < two years.
You also had better return to the U.S. as soon as possible after filing and ensure you are back before your current Green Card expires.
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