It was a great surprise to everyone ___John changed his mind so soon.这个句子答案是that 请问是同位语从句么 那为什么不能填why呢 我记得why也可以引导同位语从句的啊?

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It was a great surprise to everyone ___John changed his mind so soon.这个句子答案是that 请问是同位语从句么 那为什么不能填why呢 我记得why也可以引导同位语从句的啊?
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It was a great surprise to everyone ___John changed his mind so soon.这个句子答案是that 请问是同位语从句么 那为什么不能填why呢 我记得why也可以引导同位语从句的啊?
It was a great surprise to everyone ___John changed his mind so soon.
这个句子答案是that 请问是同位语从句么 那为什么不能填why呢 我记得why也可以引导同位语从句的啊?

It was a great surprise to everyone ___John changed his mind so soon.这个句子答案是that 请问是同位语从句么 那为什么不能填why呢 我记得why也可以引导同位语从句的啊?
这是主语从句哦,为了防止句子头重脚轻,通常把形式主语it放在主语位置,真正主语搁置于句末,eg:It is a pity that we won't be able to go to the south to spend our summer vacation.

that
是同位语从句
why带进去很明显意思不通

that引导的是 surprise的同位语从句,在句中不做任何成分,解释说明 surprise 的具体内容。
why 确实可以引导同位语从句,用以表示前面名词的具体内容。
令大家感到惊奇的是John那么快就改变了主意,而不是 为什么John那么快改变了主意。