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
It''s necessary that the problem _______in some way or other.
A．is settled
B．was settled
C．be settled
D．has been settled
单项选择题
I have no doubt _______most of the students in our class can pass the final examination.
A．whether
B．although
C．that
D．as
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