单项选择题

We must ______early in the morning so as to catch the first train.

A．set up
B．set out
C．set about
D．set aside
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单项选择题
I shall make the announcement ______the beginning of the meeting.
A．to
B．for
C．at
D．in
单项选择题
The bread and butter ______served for breakfast.
A．are
B．is
C．have
D．had been
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