I have called the US custom to ask this, the answer is no. You can not leave Canada for China during the 30 days.
However, it is possible doing this ONLY IF the US custom officer does not check your passport carefully. I know some people came back to US by this way. If you want to try this, you need to take you own risk.
However, it is possible doing this ONLY IF the US custom officer does not check your passport carefully. I know some people came back to US by this way. If you want to try this, you need to take you own risk.
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