【题目】_____ as a salesgirl in a department store for 3 years, I decided to set up my own business.
A. Worked B. Working
C. Having worked D. To work
在线课程【答案】C
【解析】考查非谓语动词。句意：我在一家百货公司做了3年的销售小姐，我决定自己创业。-ing分词作伴随状语,根据与主句的时间前后关系,故用现在分词完成式having done。可知答案为C。