单项选择题

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

A．adapt
B．adapting
C．having adapted
D．being adapted
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单项选择题
Were it not for your help, I ______ in trouble now.
A．was
B．had been
C．were
D．would be
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．distinguishing
C．having distinguished
D．being distinguished
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