The experiment _____ last week.A.ought to be done B.ought to do C.ought to have been done D.ought to have done为什么?我选A不对吗?为什么用现代完成时?过去时不行吗?既然是应该过去做为什么不用过去完成时?
问题描述:
The experiment _____ last week.
A.ought to be done B.ought to do C.ought to have been done D.ought to have done
为什么?我选A不对吗?为什么用现代完成时?过去时不行吗?既然是应该过去做为什么不用过去完成时?
答
这里是虚拟语气的用法
试验本应该上周就做的,但现实情况是没有做