Question

he thought it was too late to change her mind改为反义疑问句

Answer 1

正确精准的答案应该填 was it ?
即：He thought it was too late to change her mind, was it?
翻译为：他觉得太迟了而不能改变主意了，是吗？
①当主句谓语是think, believe, expect, suppose, imagine等引导的宾语从句时，疑问部分与宾语从句相对应构成反意疑问句。
②陈述部分含有表示否定意义的too...to...（太...而不能...）（too后接表感情的形容词时例外）结构时，疑问部分要用肯定形式。
如：The old lady was too moved to speak, was she?
那位老太太感动得说不出话来，是吗？
③注意：too...to...（too后接表感情的形容词，如：pleased等）不表示否定意义时，疑问部分则用否定形式。
如：They are only too pleased to help us, aren't they?
他们很高兴帮助我们，是不是？

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Answer 2

he thought 插入语，所以是

He thought it was too late to change her mind, wasn't it?

如果这个的话就不是插入语了：
Tom doesn't believe she has finished the job,does Tom?

Answer 3

主句谓语是think, believe, expect, suppose, imagine等引导的宾语从句，疑问部分与宾语从句相对应构成反意疑问句。
I don't think he is bright, is he?
We believe she can do it better, can't she?

所以，He thought it was too late to change her mind, wasn't it?

Answer 4

他觉得太迟了来不及改变她的想法了

追问

不是中文意思，要你改反义疑问句

追答

He thought it was too late to change her mind, did he?
too......to......是否定句 太而不能

Answer 5

Did he think it was too late to change her mind?

追问

he thought it was too late to change her mind，_______ _________？

追答

didn't he?
I think it depends largely on the context. "wasn't it?" could also be right.
But in general, if the subject is I or we, it's better to use "wasn't it?". If the subject is otherwise, better use "didn't + subject".
so, in this case, the best answer is "didn't he?".
考试的话这么做是对的。但是实际情况是：如果强调he的thought动作，用didn‘t he。如果强调他thought的内容，用