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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单项选择题
We have advantage ______ you in the field of manufacturing electrical products.
A．by
B．with
C．over
D．above
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 stand
C．wouldn't be standing
D．couldn't have stood
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