单项选择题

Before the meeting, a ______was held to verify information.

A． brief
B． briefing
C． briefly
D． briefed
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单项选择题
My boss gets her messages______ by a computer.
A． take
B． takes
C． taken
D． taking
单项选择题
Either the product ______the advertisement should be changed.
A． or
B． and
C． but
D． nor
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