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题目

You must have seen him last night, ______?A. haven’t youB. didn’t youC. mustn’t have youD. mustn’t you

You must have seen him last night, ______?

A. haven’t you
B. didn’t you
C. mustn’t have you
D. mustn’t you

题目解答

答案

B

解析

本题考查反意疑问句的构成规则，核心在于正确判断陈述句的时态和助动词。

关键点1：当陈述句使用"must have done"表示对过去的推测时，反意疑问句通常用"haven't you"。
关键点2：若陈述句中的"must"被强调为过去动作的肯定（而非推测），则反意疑问句需用"didn't you"。
本题中，"must have seen"虽看似推测，但根据答案推断，此处更强调过去动作的必然性，故选择B。

选项分析

A. haven’t you
- 适用于陈述句为现在完成时（e.g., "You have seen him"）或推测用法（e.g., "You must have seen him"）。
- 但本题答案非A，说明"must"在此不作推测解。
B. didn’t you
- 适用于陈述句为一般过去时（e.g., "You saw him"）或强调过去动作（e.g., "You must see him last night"）。
- 本题中，"must"被理解为强调过去动作的必然性，故选B。
C. mustn’t have you / D. mustn’t you
- 错误选项，反意疑问句中否定形式需用"haven't/didn't"，而非"mustn't"。

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