单项选择题

Questions 1 to 5 are based on the following conversation.

A． From 6 am to 6 pm.
B． From 9 am to 9 pm.
C． From 6 am to midnight.
D． All day.

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Questions 1 to 5 are based on the following conversation. 您的浏览器不支持 audio 元素。