The reason for their unusual behavior remains a 【
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The reason for their unusual behavior remains a 【puzzle】.
A. fact
B. mystery
C. statement
D.game
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答案：B
B
解析： 句意：他们不同寻常的举动依然是个谜。puzzle意为“令人迷惑的事情”;fact意为 “事实”;mystery意为“谜团”；它与括号部分单词含义最接近；statement意为“叙述”; game意为“游戏”。故选B项合适