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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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
单项选择题
Were it not for your help, I（）in trouble now.

A．was
B．were
C．had been
D．would be
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