单项选择题

Seldom ______ any mistakes during my past five years' service here.

A．would I make
B．did I make
C．I did make
D．I would make
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单项选择题
I don't believe you are wrong,______
A．do they
B．aren' t they
C．are you
D．don' t they
单项选择题
Many a professor looking forward to visiting Korea at present.
A．is
B．are
C．was
D．were
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