Question

He must have been sent to the hospital 改反意疑问句

求解 是didn't he 还是 wasn't he

Answer 1

当must用来表示对过去的情况进行“推测”（must + have done）时，如强调对过去情况的推测（一般句中有过去的时间状语），反意疑问句部分要用“didn’t + 主语”；如果强调动作的完成（一般没有过去时间状语），反意疑问句部分要用“haven’t / hasn’t + 主语”。

例 She must have read the novel last week, didn’t she? 她上星期一定读了这本小说了，是吗？

You must have told her about it, haven’t you? 你一定把这事告诉她了，是吗？

你这一题如果句子后面还有表述时间的词的话，应该用didn't he。如果没有，应该是hasn't he.

wasn't 是不能用在此处的。

Answer 2

He must have been sent to the hospital，haven't he? /didn't he?

解析：
陈述部分有must 的疑问句，疑问部分根据实际情况而定。

例：
He must be a doctor, isn't he?
You must have studied English for three years, haven't you? / didn't you?
He must have finished it yesterday, didn't he?
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