单选题 If the task is too complicated to figure out on ______ own, please don't hesitate to ask one of our representatives, who are here to help.

【正确答案】 B
【答案解析】本题需选择适当的代词。on______own是“介词+…+名词”结构的介词短语，横线处应填入修饰名词own的物主代词。on one's own表示“独立地”。