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

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

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

单项选择题

So many comrades（）absent, we decided to put the meeting off.

A. are
B. to be
C. being
D. be

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