The reason for their unusual behavior remains a

The reason for their unusual behavior remains a puzzle.

A:fact B:mystery C:statement D:game

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The reason for their unusual behavior. remains a puzzle.A．factB．mysteryC．statementD．game

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The reason for their unusual behavior. remains a puzzle.A．factB．mysteryC．statementD．game

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The reason for their unusual behavior. remains a puzzle.A．factB．mysteryC．statementD．game

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The reason for their unusual behavior remains a 【

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The reason for their unusual behavior remains a 【

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The reason for their unusual behavior remains a 【

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The reason for unusual behavior. remains a puzzle

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