单项选择题

I think it is hard to _______what you said.

A．ensure
B．convince
C．agree
D．believe
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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
It''s necessary that the problem _______in some way or other.
A．is settled
B．was settled
C．be settled
D．has been settled
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