답변을 얻은 뒤 반드시 감사의 덧글을 남기고, 좋은 답변은 채택해 주시는 센스...
질문할 때 예의를 지키시기 바랍니다.(빨리... 고수분만..... 이런 식의 요구는 자제 바랍니다.)
질문 내용 :

2010수능 37번에서 Not, that is, until lately 해석이 애매하네요. 정확한 설명 부탁드립니다
Starting in the 1960s, people began flooding into Chattanooga, a former factory town, to explore its caves, rivers, and cliffs. Before long more than 3,800 caves surrounding the city had been discovered. The nearby Ocoee was among the most paddled rivers in the country and six major climbing sites sprang up within an hour’s drive of city limits. But in spite of this boundless outdoors potential, there remained the problem of Chattanooga proper, a post-industrial wasteland that made the city the kind of place you would visit but would never want to live in. Not, that is, until lately. Over the past decade, Chattanooga has made an incredible urban comeback: electric buses, organic markets, and a 120-million-dollar riverfront restoration project completed last year. In addition, beautiful modern architecture such as the post-modern museum and the newly remodeled aquarium plays a big role in the comeback of Chattanooga