单项选择题

They overcame all the difficulties and fulfilled the plan three months ahead of time, ______ is something we had not expected.

A．that
B．what
C．it
D．which
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单项选择题
According to a ______, the majority would rather have newspapers without a government than a government without newspapers.
A．election
B．campaign
C．poll
D．vote
单项选择题
Not until Mr. Smith came to China ______ what kind of country she is.
A．he knew
B．he didn't know
C．did he know
D．he couldn't know
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