This is the 4750th most frequent Korean word.
계속됐다
"Continued"
In this sentence, '계속됐다' is used to imply that an action ('studying') persisted without interruption.
그는 공부를 멈추지 않고 계속됐다.
He continued studying without stopping.
Here, '계속됐다' describes an event ('rain') maintained presence over a period of time.
비가 아침부터 계속됐다.
The rain continued since the morning.
In this usage, '계속됐다' conveys that an occurrence ('meeting') prolonged beyond the expectation.