单项选择题

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单项选择题
A．At a conference hall.B．At an art gallery.C．At an airport.D．At a hotel.
A．At a conference hall.
B．At an art gallery.
C．At an airport.
D．At a hotel.
单项选择题
This letter is written by a________.
A．high school student
B．prospective salesperson
C．publisher
D．manager
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