单项选择题

Questions 11 to 18 are based on the conversation you have just heard.

A．In the morning.
B．Late at night.
C．After 5: 30. ’
D．At or before 5: 30.
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单项选择题
A．forB．byC．withD．as
A．for
B．by
C．with
D．as
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