She would like to know the reason ________ fewer and fewer students are showing interest in her lesson.
A.for
B.why
C.for that
D.which
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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。