Susan can have written a report为什么不用ought to not have

问题描述:

Susan can have written a report为什么不用ought to not have

Susan can have written a report意思是苏珊本应该写一篇报道(但实际上没写),是虚拟语气,所以不能改为ought to not have.
还有不懂,可以继续追问哦,