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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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
单项选择题
If you try to pass（）the problems, it would be impossible for you to make any progress in this field.

A．off
B．over
C．by
D．across
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