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ひと通り英語に直してみました
1 I had never had mutton until I visited Hokkaido.
2 Lily had been watching a movie for two hours when her mother came home.
3 The drama will have finished by the time Ryo arrives home.
4 I found I had left my smartphone on the bus.

リー

遅れてすみません!
ありがとうございます!

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