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I know from personal experience that it's very uncomfortable when people around you are speaking a language you don't understand, so I would say it would be better to speak English on the sales floor definitely. I was in Germany once and the group I was with chose to speak only German, which I don't speak, even though all of them knew French and English, which I do speak. I was a little put out, but it would've been worse had I been in a place of business.
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