单项选择题

Before you conduct a survey, you' d better refer to certain books.

A. career
B. holiday
C. plan
D. research
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单项选择题
It remains a puzzle about why our outermost planet exists.
A. problem
B. mystery
C. question
D. point
单项选择题
We succeed in building the power station in a deep valley as we had expected.
A. come off
B. go off
C. bring off
D. make off
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