单项选择题

听力原文：W: The bus is late. I've been waiting for an hour.
M: It's eight o' clock now, so we should be boarding in a minute.
Q: When did the man begin to wait at the station?
(5)
A．At 9 o'clock.
B．At 7 o'clock.
C．At 8 o'clock.
D．At 6 o'clock.

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