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뭘 했는데

what did … do?

→ 뭐+를
phrase Rare #21,077
what did … do? The ending -는데 can add a prompting or challenging tone, like asking for an explanation.
KO: 너 어제 뭘 했는데?
EN: What did you do yesterday?

내가 뭘 했는데?

What did I do?

— 홍등 (1991)

당신은 뭘 했는데?

What did you do?

— 음식남녀 (1994)

둘이 뭘 했는데

What did the two of them do?

— 신경쇠약 직전의 여자 (1988)