单项选择题

Before you carry out a survey, you should have a careful planning.

A. career
B. search
C. plan
D. research
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单项选择题
The price of this machine is not reasonable.
A. helpful
B. kind
C. fair
D. effective
单项选择题
I think they are quite confident in their conclusion.
A. certain
B. worried
C. suspicious
D. doubtful
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