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
These ideas can be applied to the practice.
A. be attached to
B. be practiced in
C. be cancelled by
D. be taken away
单项选择题
The study has posed a question about this nature.
A. supported
B. cancell
C. aroused
D. raised
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