After studying in a medical school for five years, Mary ______ her job as a physical therapist in the countryside.
 
【正确答案】 C
【答案解析】 set out动身,起程;开始;摆放;陈述 take over接收,接管;承袭 take up开始从事;继续下去;着手处理 set up创立,建立,架起,建造;开业