回複：多謝各位, 可以在中國等AP嗎? 家裏有急事. 485 , AP 還未收到receipt.

If you want to use AP, you have to wait here to get it before you back to China.
If you have emergency situation, you can go to local office to submit your expedite processing request with your evidence. They can ask USCIS center to process your case within 2-3 days.