单项选择题

I shall make the announcement ______ the beginning of the meeting.

A．to
B．for
C．at
D．in
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单项选择题
It is essential that all these figures ______ twice.
A．must be checked
B．be checked
C．is checked
D．will be checked
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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