선언했던

In a sentence

• 그가 자신의 계획을 공개적으로 선언했던 것은 모두를 놀라게 했다.

  His public announcement of his plans surprised everyone.

  In this sentence, '선언했던' refers to a past tense action where someone announced or declared something publicly.

• 우리가 당시 선언했던 목표는 현재 그대로 유지되고 있다.

  The goals we declared back then are still being maintained today.

  Here, '선언했던' is used to describe goals that were declared in the past.

• 그들은 새로운 정책을 발표하며 이를 역사적인 변화라고 선언했던 것이다.

  While announcing the new policy, they declared it a historic change.

  '선언했던' indicates a past declaration by a subject about a significant change.