英语大神帮忙看看我分析的一道单选题对吗
An idea suddenly came to J.K.Rolling ______ she could write a book about people living in the magic world.
A.if B.when C.that D.which
首先先行词是个人,所以我排除了which
if不引导定语从句
when指时间,但是句意不符合
所以选C