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

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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

（）he finishes his task, the team leader doesn't mind（）at the work site.

A．So long as ... what time he arrives
B．So far as ... when he arrives
C．As long as ... however late does he arrive
D．Provided ... no matter how long does he arrive