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どこで習った

where did you learn it

→ どこ
phrase Rare #32,349
where did you learn it An informal question with the subject and object omitted. 習った refers to something learned or studied in the past; the context may specify what was learned, such as a language or skill.
JA: その料理はどこで習ったの？
EN: Where did you learn to make that dish?

そんなこと、どこで習ったの？

Where did you learn that?

スキーをどこで習ったか、トムが尋ねてきた。

Tom asked where I had learned to ski.

ポルトガル語はどこで習ったの？

Where did you learn Portuguese?

トムが、スキーはどこで習ったかって聞いてきたんだ。

Tom asked me where I learned to ski.

どこで習った

Where did you learn that?

— いまを生きる (1989)