将下列句子改为被动语态,英语.1Don't they tell you about it?2.Yesterday our teac_英语解答

将下列句子改为被动语态,英语.
1Don't they tell you about it?
2.Yesterday our teacher asked us to clean the classroom.
3.we must keep the noise under 50dbs here.

人气：498 ℃　时间：2019-10-25 15:36:19

解答

1.Aren't you told by them?
2.we were asked to clean the classroom by our teacher.
3.The noise must be kept under 500dbs here.