It______ years ago when the incident took place, and I nearly forget it.A.would have beenB.should have beenC.ought to have beenD.must have been
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D解析试题分析：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。
考点：考查情态动词+完成式的用法