She would like to know the reason ________ fewer and fewer students are showing interest in her lesson．A.forB.whyC.for thatD.which
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B解析本题考查reason后引导定语从句的关系代(副)词。首先分析一下定语从句的结构，主谓齐全，空格中只能填入状语成分，所以使用关系副词why。句意为：“她想知道为什么越来越少的学生对她的课感兴趣。”若将C项改为for which也对。