题目内容：

25.------"You ought to have come here ten minutes ago?"
--------"Yes,I _________."
A.ought to B.ought to have C.ought D.have ought to
为什么选B,不选A?

优质解答

ought to have donesth表示应该做某事而没有做,在回答时如果省略have就不能体现没有做这点,这也算是英语的一个习惯用法吧.