单项选择题

-- Why do you think he is a liar
-- We have proved（）many times.

A. so
B. as much
C. him
D. it

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单项选择题

（）the temperature going down so quickly, I don't think we are able to go on with our experiment.

A. For
B. By
C. From
D. With

单项选择题

To get into the habit of smoking means（）one's own life short.

A. make
B. making
C. to make
D. made

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