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

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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

单项选择题

The commercial purpose of a trade mark is（）the goods or services of a company from those of competitors.

A．to distinguish
B．having distinguished
C．distinguishing
D．being distinguished

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