单项选择题

—What is the book about
—It concerns______your money.

A．investing
B．to invest
C．about investing
D．with investing
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单项选择题
That town was no longer the sleepy little village______.
A．it has been being
B．it has been
C．it was
D．it had been
单项选择题
—Do you smoke—I______, but I quit.
A．used to do
B．used to
C．used to doing
D．used
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