单项选择题

He is always here; it's surprised you' ve never met him.

A. unique
B. strange
C. rare
D. particular
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Before you conduct a survey, you' d better refer to certain books.
A. career
B. holiday
C. plan
D. research
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It remains a puzzle about why our outermost planet exists.
A. problem
B. mystery
C. question
D. point
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