单项选择题

I saw______man going into the office．I don't know who ______ man was．

A．-/the
B．the/a
C．a/the
D．a/a
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单项选择题
You mustn't mind ______ trouble over the cooking if you want your guests to enjoy their meal.
A．take
B．to take
C．taking
D．taken
单项选择题
Five hundred dollars ______ expensive. Have you nothing cheaper
A．are
B．to be
C．is
D．has been
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