This is the 11429th most frequent Korean word.
꺼냈었던
"Had taken out" or "had brought up."
In this sentence, '꺼냈었던' conveys the past action of bringing up or mentioning a topic that occurred prior to the current timeframe.
그는 지난 이야기에서 꺼냈었던 주제를 다시 시작했다.
He resumed the topic he had brought up in the previous story.
Here, '꺼냈었던' is used to describe a past instance of having taken out or retrieved the book, indicating that the action occurred earlier.
내가 어제 꺼냈었던 책을 어디에 두었는지 기억이 안 나.
I can't remember where I placed the book I took out yesterday.
The usage of '꺼냈었던' in this sentence refers to ideas that were previously discussed or suggested, thus emphasizing an earlier action of bringing forth ideas.