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
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单项选择题
The building he paid a visit to _________at the end of the street.
A．stand
B．standing
C．stands
D．stoop
单项选择题
I''ve never seen the young man _________next to the director.
A．sits
B．sitting
C．sat
D．to sit
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