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
If you really want to apply for the dangerous job, I （） in your way.

A．shouldn't have stood
B．wouldn't be standing
C．wouldn't stand
D．couldn't have stood
单项选择题
She was running （） balance, with her feet wrongly positioned.

A．on
B．off
C．in
D．over
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