题目内容：
What do we know about the post service in the old days?
A．Hotels offered post service. B．Letters were sent to the door.
C．When letters would arrive was not clear.
参考答案：
答案解析：
单选题：What do we know about the post service in the old days?
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B．Letters were sent to the door.
C．When letters would arrive was not clear.