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
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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
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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