The reason for their unusual behavior remains a puzzle.

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问题 The reason for their unusual behavior remains a puzzle.

选项 A、fact
B、mystery
C、statement
D、game

答案B

解析 puzzle这个名词的意思是“令人困惑的事情或问题、不解之谜”。四个选项中只有 mystery和它同义。又如：It is still a puzzle／mystery how the ancient Egyptians built the pyramids．(古埃及人究竟怎样建造金字塔至今还是个没有解开的迷)。

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