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---Why, the door is still open.
---How come? Iím pretty sure I remembered to lock it.
Is this dialogue natural from a native's point of view?
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Also, the second speaker would not say "How come?", because the first speaker obviously doesn't know why.
---The door is still open.
---How come? I’m pretty sure I remembered to lock it.
What about this time?
Thanks for your help!