回复:我该往何处寄I-94 卡

when your dad left for China, he should turn in the receipt of B-2 renewal to airport clerk. Then after you receive the official B2 approval, mail it to your dad and let him keep it (very important). Next time, if he need to apply for another B-2 to visit you, he should show it to VO as proof that his stay beyond original 6month visits was legal.

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