But for my classmates' help, I______the work in time.
【正确答案】 D
【答案解析】解析:本题考查虚拟语气。此句含有含蓄条件but for my classmate’s help,因此是虚拟语气。因为是和过去的事实相反,主句用would have done,因此D为正确答案。