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After he had worked there for 30 years, Haydn moved to London, where he was very successful.
________ ________ there for 30 years, Haydn moved to London, where he was very successful.
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句型转换
After he had worked there for 30 years, Haydn moved to London, where he was very successful.
________ ________ there for 30 years, Haydn moved to London, where he was very successful.