单项选择题

If either of you had been able to hold（）your anger, the fight would have been avoided.

A．back
B．in
C．for
D．against

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单项选择题

Once he set his mind to（）something, he would not give up easily.

A．do
B．doing
C．be doing
D．having done

单项选择题

By（）your work environment and personal practices, you may be able to reduce fatigue and discomfort.

A．adapt
B．having adapted
C．adapting
D．being adapted

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