12. 밑줄 친 부분 중 글의 흐름상 가장 어색한 것은?
In 2007, our biggest concern was "too big to fail." Wall Street banks had grown to such staggering sizes, and had become so central to the health of the financial system, that no rational government could ever let them fail. ①Aware of their protected status, banks made excessively risky bets on housing markets and invented ever more complicated derivatives. ②New virtual currencies such as bitcoin and ethereum have radically changed our understanding of how money can and should work. ③The result was the worst financial crisis since the breakdown of our economy in 1929. ④In the years since 2007, we have made great progress in addressing the too-big-to-fail dilemma. Our banks are better capitalized than ever. Our regulators conduct regular stress tests of large institutions.
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