that the dog was the first animal to be domesticated is generally agreed upon byauthorities in the field 为什么是dog 前面要填that the 而不是the

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that the dog was the first animal to be domesticated is generally agreed upon by
authorities in the field 为什么是dog 前面要填that the 而不是the

That 引导主语从句.
主语:That the dog was the first animal to be domesticated
谓语:is generally agreed upon by authorities in the field

我们完全可用问题中的句子作一篇文章的第一句,然后接着写下去,根本不必有任何“前文”.

that之前一定还有前文 这里that只是引导下面的从句。