문제 내용: 어법상 옳은 것은?
선택지 1: They didn't believe his story, and neither did I.
선택지 2: The sport in that I am most interested is soccer.
선택지 3: Jamie learned from the book that World War I had broken out in 1914.
선택지 4: Two factors have made scientists difficult to determine the number of species on Earth.