一道英语选择题,求解析和翻译,速求 Do you know the reason ____ she has changed her mind?

一道英语选择题,求解析和翻译,速求 Do you know the reason ____ she has changed her mind?

题目
一道英语选择题,求解析和翻译,速求 Do you know the reason ____ she has changed her mind?
A why B which C for that D of which
答案
A
你知道她改主意的原因吗?
the reason 后一般接why引导的从句.(如果关系词作状语) why=for which
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