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했군요

did, have done

→ 하다
했 Past tense + 군 Exclamatory ending expressing realization or mild surprise + 요 Polite speech
verb · formal, past tense Rare #29,697
did, have done The ending -군요 expresses realization or mild surprise; it is polite.
KO: 벌써 숙제를 다 했군요.
EN: Oh, you’ve already finished all the homework.
Conjugation of 하다

미안하지만 먹을 것 천지 라는 걸 다들 알면서 한마디도 안 했군요

Sorry, but you all knew there was plenty to eat and didn't say a word.

— 행복한 라짜로 (2018)