早教吧 育儿知识 作业答案 考试题库 百科 知识分享

I couldn’t possibly have finished such a long book in such a short time.我想知道,为什么用 have finished ,而不用finish?

题目详情
I couldn’t possibly have finished such a long book in such a short time.
我想知道,为什么用 have finished ,而不用finish?
▼优质解答
答案和解析
could have do sth.表推测,这句话的意思是“我不可能在如此短的时间内完成一本书”,因为结果还不知道,所以用表推测的句型.