They have finished their work主动句改为被动句

I don't believe they have finished their work yet,have they 如何回答.Yes.,they ( ) They must have finished the work,---?A,mustn't they B,haven't they C,hadn't they D,didn't they They didn't have finished it by last Sunday.为什么didn't have要改成hadn't? Why haven't they finished this work yet?They are supposed _______ it by Friday evening.A.to finish B.having finished C.finished D.to have finished选哪一个 They haven't finished their work.Maybe they have some trouble_____(in/with)it.这两者有什么区别? They have all finished doing the exercises They must have finished their homework,_______. They have not finished counting 的译文 they must have finished the work by the end of last month,___?a,mustn't they b,haven't they c,hadn't they d,didn't they They must have finished the work by the end of last month,______?A.mustn't they B.haven't they C.hadn't they D.didn't they 一道英语改错题,帮帮忙,O(∩_∩)O谢谢!They didn't have finished it by last Sunday.为什么didn't have要改成hadn't? 改错：He doubed they finished the job ,didn't they?改错：1.He doubed they finished the job ,didn't they?a.doubed b.finished c.didn't d.they2.I have learned of the lecture about when to plant wheat.a.learned b.of c.when d.to plant3.The famers mu couldn't have finished和 can't have finished 的区别 I don't think they must have finished file project by the end of last month ,______?为什么是had they? They were ---to have finished their assignments on schedule.However,they didn't.A,supposed B,supplied C,satisfied D,imagined, They have already finished tgeir work改为一般疑问句 They have finished their work主动句改为被动句 They have already finished the work.如何改为否定句