改错：One of the men held the opinion when what the book said was right.

题目

改错：One of the men held the opinion when what the book said was right.
答案是将when改为that,为什么?

答案

that what the book said was right是一个同位语从句,是对opinion 内容的解释说明.what the book said was right是一个完整的句子,所以用that 就可以了,that 在名词性从中中只起连接词的作用,不充当任何成分.
加油!