单项选择题

He works in a sports centre instructing people in the use of the gym equipment.

A. helping
B. teaching
C. informing
D. ordering
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The reason for their unusual behavior remains a puzzle.
A. fact
B. mystery
C. statement
D. game
单项选择题
In judging our work you should take into consideration the fact that we have been very busy recently.
A. thought
B. mind
C. account
D. memory
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