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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单项选择题
Only yesterday ______ out that my documents were missing.
A．did I find
B．I have found
C．I found
D．Had I found
单项选择题
Once he set his mind to ______ something, he would not give up easily.
A．do
B．be doing
C．doing
D．having done
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