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다음 글의 밑줄 친 부분 중 어법상 옳지 않은 것은?
In the 1860s, the populations of Manhattan and Brooklyn were rapidly increasing, and ①so was the number of the commuters between them. Thousands of people took boats and ferries across the East River every day, but these forms of transport were unstable and frequently stopped by bad weather. Many New Yorkers wanted to have a bridge directly ②connected Manhattan and Brooklyn because it would make their commute quicker and safer. Unfortunately,
because of the East River's great width and rough tides, ③it would be difficult to build anything on it. It was also a very busy river at that time, with hundreds of ships constantly ④sailing on it.

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