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I don't understand how "When someone" translates to "Que l'on" in

Je suis à peine assis que l'on frappa à la porte

Because I'd understand if it was

Je suis à peine assis quand on frappa à la porte

Why does que le translate into when?

marked as duplicate by Stéphane Gimenez Jun 13 '16 at 18:44

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