" at the beginning of everything you post! Here you are not asking if the sentence is correct in American English. You are using English to ask the question itself.
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bassaAnd if I want to change it to the past tense I would say "which one were you doing?". it is better than saying "Which one did you do?", right?Not really. If he finished and some time has passed, you would probably ask "Which one did you do?"