单项选择题

Because of the reduction of air pollution, this city now is a good place（）.

A．where to live
B．which to live
C．to live in
D．to be lived

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单项选择题

Criticism and self-criticism is necessary（）it helps us to find and correct our mistakes.

A．for that
B．at that
C．with that
D．in that

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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