帮忙解决英语问题，谢谢

1.A needn't have washed
表示过去不必做而实际上已经做了的事情，用 needn't have done；　　
2.C must have studied
表示对过去事情的肯定推测，用must have done；
3.A) can't have been
表示对过去事情的否定推测，用can't have done，这里是它的被动语态；　　
4.C，might have sailed
表示对过去事情的不太肯定的推测，用might have done
5.A) should have been
表示对过去事情的比较肯定的推测，用should have done；　　
6. C) must have changed
同2　　
7. D) needn't have gone
同1
8. D) ought to have received
表示过去应该做而实际上没有做成的事情，用ought to/should have done
9.B)shouldn't have gone
表示过去不应该做而实际上却做了的事情，用ought not to/should not have done
10. D) should have got up
同8

【俊狼猎英】团队为您解答。祝你进步。

1.A
2.C
3.B
4.C
5.B
6. C
7. D
8. D
9.B
10. D
全是关于情态动词的练习，给你答案后句子并不难理解，自己翻译吧！

ACCCB DDBBA