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に聞いたの

asked …?

→ に
phrase Uncommon #16,693
asked …? に marks the person being asked. の makes this a casual question; 聞く can also mean “hear,” depending on context.
JA: 先生に聞いたの？
EN: Did you ask the teacher?

なぜ大佐に聞いたの？

Why did you ask the colonel?

— ア・フュー・グッドメン (1992)

「奥さんに聞いたの？」

Did you ask your wife?

トムに聞いたの？

Did you ask Tom?

彼はもうあなたに聞いたの?

Has he asked you yet?

— ウィキッド ふたりの魔女 (2024)

誰に聞いたの？

Who did you hear that from?

— 箪笥＜たんす＞ (2003)

マルファばあちゃんに聞いたの？

Did you ask Grandma Marfa?

— 動くな、死ね、甦れ！ (1990)

そのやり方、誰に聞いたの？

Who did you learn that method from?