几个英语的改错问题1.Where do persons come from is still unknown to us
几个英语的改错问题
1.Where do persons come from is still unknown to us all.
2.Where and when the meeting will be held have not been dicided yet.
3.Can you tell me what do they usually do in their offices?
4.I don't know when they come for this dictionary.
说明原因的给最佳,直接写答案的同样感谢