单项选择题

Mr. Smith used to smoke ______ but he has given it up recently.

A．roughly
B．seriously
C．heavily
D．hardly
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单项选择题
Hospital doctors don't go out very often as their work ______ all their time.
A．takes in
B．takes away
C．takes over
D．takes up
单项选择题
Not until all the fish died in the river ______ how serious the pollution was.
A．the villagers realized
B．the villagers did realize
C．did the villagers realize
D．didn't the villagers realize
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