Question

The room must have been cleaned by Tom yesterday, ________ it?

The room must have been cleaned by Tom yesterday, ________ it?
A. mustn't B. hasn't C. didn't D. wasn't
选D

Answer 1

The room must have been cleaned by Tom yesterday, ________ it?
A. mustn't B. hasn't C. didn't D. wasn't
选D
这边是【must have been done】的结构，表示的是一种对过去的推测
所以反义疑问散亩唯句不用mustn't it 而耐汪用【wasn't it】这是一种特殊冲培用法
有不会的可以再问我

Answer 2

D 前面的句中用must表示猜测，而在反义疑问句中要根据实际情况。