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
The bread and butter ______ served for breakfast.
A．are
B．is
C．have
D．had been
单项选择题
Anyone can get into the club, ______ he is a member there.
A．even if
B．unless
C．as that
D．so long as
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