She would like to know the reason ( ) fewer and fewer students are showing interest in her class.

题目

She would like to know the reason ( ) fewer and fewer students are showing interest in her class.
She would like to know the reason () fewer and fewer students are showing interest in her class.
A.for B.why C.for that D.which
C为什么改为for which就对了?

答案

which是关系代词,介词+关系代词一般等于关系副词.而why为关系副词.故,可以为why,也可以为for which.完.