Ms Li _____as a biology teacher for fifteen years in our school and now she is Party
问题描述：
Ms Li _____as a biology teacher for fifteen years in our school and now she is Party
secretary of our city
A works B worked C had worked D has worked
答
选D has worked
解析：剧中用for fifteen years 表示“过去延续到现在的情况”,所以时态应该用现在完成时.