单项选择题

Only when I began to do it ______ that I had made a mistake.

A．I realized
B．I had realized
C．did I realize
D．would I realize
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单项选择题
In winter, traffic accidents occur ______ on the highway.
A．frequently
B．suddenly
C．usually
D．rapidly
单项选择题
Staying in a four-star hotel for a night costs ______ renting a house in the suburb for a month.
A．twice as much as
B．twice more
C．as much as twice
D．as much twice as
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