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
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单项选择题
The secretary worked late into the night, __________ a long speech for the president.
A．to prepare
B．preparing
C．prepared
D．was preparing
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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