单项选择题

Criticism and self-criticism is necessary ______it helps us to find and correct our mistakes.

A．by that
B．at that
C．on that
D．in that

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单项选择题

John Smith, being a diligent student, never refuses to ______more responsibilities that are assigned to him.

A．take on
B．take in
C．take off
D．take up

单项选择题

I was advised to arrange for insurance _____I needed medical treatment.

A．nevertheless
B．although
C．in case
D．so that

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