your room must have been cleaned yesterday,_____ it?答案是wasn't it 请明确回答谢谢

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your room must have been cleaned yesterday,_____ it?答案是wasn't it 请明确回答谢谢

your room must have been cleaned yesterday,_____ it?答案是wasn't it 请明确回答谢谢
your room must have been cleaned yesterday,_____ it?答案是wasn't it 请明确回答谢谢

your room must have been cleaned yesterday,_____ it?答案是wasn't it 请明确回答谢谢
做反义疑问句的时候 首先要搞清楚助动词是哪一个
例如You must have been playing tennis at the time,这句话中have做助动词 引导现在完成进行时 故应该是
You must have been playing tennis at the time ,haven't you
She must have a kind mother,这句话中must表示推测,而不是表“必须”,反意疑问句应该提取后面的助动词 have做的是实意动词 表示“有”的意思 其助动词应该是do
因为是第三人称单数 所以应该是She must have a kind mother,doesn't she?

反义疑问句,前肯后否,而且have是现在完成时标志词,句末要用be而不用have来否定

你的房间昨天一定已经(被)清理过了。
must have done 一定已经做过... 过去发生事情十分有把握的推测。
对过去的事情反问,用一般过去时,it指代your room.
希望能帮到你!为什么不是hasn't it?must have done 表示对 过去的事情 的推测 强调过去...

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你的房间昨天一定已经(被)清理过了。
must have done 一定已经做过... 过去发生事情十分有把握的推测。
对过去的事情反问,用一般过去时,it指代your room.
希望能帮到你!

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it代词,指代前面的整句话说的内容(你的房间昨天被打扫过了),而且说的是过去的事情,所以用过去式!

must have been done 是情态动词must 表示推测,反义疑问句变主体动词的否定形式,有yesterday推断出过去,而且是被动,所以是wasn't it