单选题
It can be inferred from the passage that the following events occurred the earliest is ______.
【正确答案】
A
【答案解析】从本文的叙述顺序上可知，Freud’s study和Republic是四者中较靠前的研究，通过第一段an old idea，already mentioned in Republic. Freud accepted this idea可知the writing of Republic发生在前。