I think you'll get mixed responses to this question. Either one can be acceptable, depending on your viewpoint. There are three distinct times: the terrible thing happened, you thought about it, you are telling about it.
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TuongvanI know that the past perfect expresses an action which happened before another action or a point of time in the past.So in the sentence I originally posted, there are three distinct times:Your timeline is wrong.
"the terrible thing happened" Past
"you thought about it" Past
" you are telling about it." Present
Tuongvan I am still confused about what you just explained.No.3 is "now I relate the story", which is present, not past.No, it's number four. Check my timeline above.
TuongvanThis thing happened so many years ago that I haven't thought /hadn't thought about it in a long time until today..I would not combine in a long time and until today in the same sentence. I would use only until today.