我是加拿大公民，過去一直用TN，進出美國也不需要簽證。最近換成了H1B，並準備回中國度假，請問回美國時需要簽證嗎？
-No. Just show your H1 approval notice, the employment verifcation letter from your employer (may also bring your recent 3 month paycheck stubs in case) and your passport to the CBP officer as yopu did for your TN.
