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을 했어요

did

→ 을
phrase Rare #24,820
did A polite past-tense pattern used after a noun ending in a consonant with 하다 verbs. The noun plus 을 했어요 means “did [the activity]”; for example, 계산을 했어요 means “I paid” or literally “I did the calculation.”
KO: 운동을 했어요.
EN: I exercised.

다른 생각을 했어요

I thought otherwise.

— 타이타닉 (1997)