It is cold in the room . You must have turned off the steam, ____ you.反义疑问句
问题描述：
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?
答
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