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
单项选择题
We have advantage ______ you in the field of manufacturing electrical products.
A．by
B．with
C．over
D．above
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