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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It is a question ______ the book will be published this month or next month.
A．if
B．whether
C．that
D．which
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I shall make the announcement ______ the beginning of the meeting.
A．to
B．for
C．at
D．in
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