we agreed to accept _they thought was the best tourist guide

问题描述:

we agreed to accept _they thought was the best tourist guide
a whatever
b whomever
c whichever
d whoever
麻烦详解为什么不是c

D turist guide 导游 指人 排除 A.C
whoever 引导后面的从句,做从句……was the best tourist guide的主语
they thought 可以看做插入语
whichever 是无论哪一个,不指人