问题补充:
It years ago when the incident took place, and I nearly forget it.
A. would have been
B. should have been
C. ought to have been
D. must have been
答案:
A. would have been
B. should have been
C. ought to have been
(答案→)D. must have been
解析:考查情态动词+完成式的用法:句意:那一定是在很多年前发生的事情,我几乎要忘了。Must have done过去一定做了,would have done过去会做但是没有做,should have done本应该做却没做,ought to have done过去本应该做却没有做,选D。