They must have done their homework yesterday,___?为什么是didn't they?我觉得应该是haven't they啊?

must have been done must have done that must have done the must be must have done 区别 They must have done their homework yesterday,___?为什么是didn't they?我觉得应该是haven't they啊? must have been done/must be done求解两者异同 must be done和 must have done区别 must have done和have done有什么区别 They must have done their homework yesterday,____?这个句子的反意疑问句为什么是didn't they呢? Some of the pyramids still look much as they must have done when they were built thousands.请分析一下look much as they must have done 的语法, must have been与must have done的区别? must have done 的反义疑问句怎么说 He must have done nothing but ____ Must Have Done Something Right 歌词 Ought to have done .must have done.should have done的区别 could have done,should have done ,must have done,的区别是什么... must have done和must be的区别?权威 must have done 表示猜测 那 must do 表示什么 must have done,must do,can't have done,can't do的区别