单项选择题

The message ______ Mr. Black was elected chairman of the committee arrived just in time.

A．which
B．what
C．that
D．how
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单项选择题
Not until that day ______ the importance of good manners in a job interview.
A．did I realize
B．I did realize
C．I have realized
D．have I realized
单项选择题
They had talked only for a few minute ______ they found they were of different opinions.
A．unless
B．while
C．before
D．once
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