题目内容
（请给出正确答案）
[主观题]
A．From the name of the horse first used to carry mails.B．From the name of the city whe
A．From the name of the horse first used to carry mails.
B．From the name of the city where this service first started.
C．From the name of the office along the road.
D．From the name of the stopping places for messengers.
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