It is cold in the room . You must have turned off the steam, ____ you. 反义疑问句为什么只能填haven't 而不能填didnt ,应该是两个都可以吧?

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It is cold in the room . You must have turned off the steam, ____ you.  反义疑问句为什么只能填haven't  而不能填didnt  ,应该是两个都可以吧?

It is cold in the room . You must have turned off the steam, ____ you. 反义疑问句为什么只能填haven't 而不能填didnt ,应该是两个都可以吧?
It is cold in the room . You must have turned off the steam, ____ you. 反义疑问句
为什么只能填haven't 而不能填didnt ,应该是两个都可以吧?

It is cold in the room . You must have turned off the steam, ____ you. 反义疑问句为什么只能填haven't 而不能填didnt ,应该是两个都可以吧?
不对.
看句子时态.前句使用have done 的形式,表明此句为现在完成时
如果用didn't则是一般过去式,与原句不符,所以不能用

只能填mustn t(小撇我打不上,用空格代替一下啊)

不能填didnt, 句子是must have done形式,反义疑问句要根据must 后面的动词而定,所以只能填havent

因为句子是must have done形式,反义疑问句要根据must 后面的动词而定,所以只能填haven't,前肯定后否定的形式