I have to express my disappointment that you couldn't reach a compromise.
Her fans' delight in her Nobel prize was mixed with disappointment that it had rendered her mute.
She finally died because of disappointment that her husband had survived in the accident.
1. disappointment 后的 that 从句,都是同位语从句。结构上是很明显的,语义上也符合逻辑。
2. 虽然三个 that 从句结构上是同位语从句,但意思上表示“原因”。在理解时可以把同位语从句,按照原因状语从句理解。
3. 语法书只讲规则,举例不可能面面俱到,不一定把每个同位语从句的先行词都列出来。但实际语言中却客观存在着,你只需动脑子,就能判断出来。