when did you arrive.the museum?

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whendidyouarrive.themuseum?whendidyouarrive.themuseum?whendidyouarrive.themuseum?atthemuseum博物馆,是具体的

when did you arrive.the museum?
when did you arrive.the museum?

when did you arrive.the museum?
at
the museum 博物馆,是具体的小地点,用at
国家,城市等大地点用in