she shuddered at the thought that she could have been killed...为什么用at.这是同位语从句吗

题目

she shuddered at the thought that she could have been killed...为什么用at.这是同位语从句吗

答案

shudder (vi.) 指（因恐惧、寒冷或想到不快的事而短暂地）打颤,颤抖
短语：shudder at 对...感到恐惧
shudder to do sth.恐惧做某事
（我在电子词典上查的,应该准确）
that后面是同位语从句,句子解释thought的具体内容