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
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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
单项选择题
The scientists wanted to keep people ______ about the breakthrough in their experiment.
A．inform
B．informed
C．informing
D．to inform
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