问题
选择题
Liu Fang is a company CEO now, but she ____ as a teacher in a middle school for three years.
A．worked
B．has worked
C．works
D．had worked
答案
答案：A
题目分析:考查动词时态。从上文可知她在学校工作是过去的事情，和现在无关，故用一般过去时表示单纯发生在过去的动作或存在的状态，答案选A。句意：刘芳现在是公司的CEO，但是她曾在一所中学当过三年教师。