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関係副詞のwhereを使っているのでinが消えます
I visited the town. I had lived in the town before.
が元の文で
関係代名詞を使うと
I visited the town which I had lived in before.
I visited the town in which I had lived before.
関係副詞を使うと
I visited the town where I had lived before.
になります

ゆう

ありがとうございます❗

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