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
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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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