We have done thing we ought not to have done and___undone things we ought to have done.A.left B.leaving.为什么是A,B为什么不可以

来源:学生作业帮助网 编辑:作业帮 时间:2024/11/08 07:46:41

We have done thing we ought not to have done and___undone things we ought to have done.A.left B.leaving.为什么是A,B为什么不可以
We have done thing we ought not to have done and___undone things we ought to have done.
A.left
B.leaving.为什么是A,B为什么不可以

We have done thing we ought not to have done and___undone things we ought to have done.A.left B.leaving.为什么是A,B为什么不可以
and 前面已经是过去时了...