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    【题目】It remains a puzzle for scientists ______ pleasant smells do not reduce pain in men.

    A. whatB. why

    C. howD. whether

    【答案】B

    【解析】

    考查同位语从句的引导词。句意：为什么令人愉悦的气味不能减轻男性的痛苦，这仍然是科学家们的困惑。本句为同位语从句修饰puzzle，且从句中缺少原因状语，故选B。

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