单项选择题

Running is often（）your health.

A. good for
B. good at
C. good of
D. good in

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单项选择题

A man escaped from the prison last night. It was a long time（）the guards discovered what had happened.

A. before
B. until
C. since
D. when

单项选择题

（）we know, smoking is harmful for our health.

A. So far as
B. So far
C. So long as
D. As to

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