【题目】It remains a puzzle for scientists ______ pleasant smells do not reduce pain in men.
A. whatB. why
C. howD. whether
在线课程【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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