单项选择题

The ______ salary of the staff is about $50.

A．usual
B．average
C．equal
D．common
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I haven t met him ______ the last committee meeting.
A．for
B．since
C．at
D．before
单项选择题
The May Day Holiday ______ over, we must now get down to work.
A．be
B．being
C．to have been
D．to be
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