34．Where do you often see the sign “BUSINESS HOURS 9:00---18:00 ? A．In a hospital. B．At a sc——青夏教育精英家教网——

34．Where do you often see the sign “BUSINESS ＨOURS 9:00---18:00” ?

A．In a hospital. B．At a school. C．In a factory. D．At a post office

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