Question

She insisted that she had done it right是什么从句？

Answer 1

she是主语，insisted是谓语动词，后面的部分是that引导的宾语从句。构成“主谓宾”结构。
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Answer 2

insisted 后跟的从句 that she had done
it right 是宾语从句，意思是她坚持说她做得对。

Answer 3

that引导的宾语从句。