单项选择题

A．Driving.
B．Working.
C．Exercising.
D．Writing.
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单项选择题
Market research is usually very_________, involving thousands of people answering hundreds of questions.
A．detailed
B．details
C．detail
D．detailing
单项选择题
I hope you''ll advise me what _________after class.
A．do
B．to do
C．doing
D．to be done
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