英语：I work as ateacher. she worked as nurse.为什么一个用过去式呢?

英语：I work as ateacher. she worked as nurse.为什么一个用过去式呢? She has (work) as a nurse for three years. She _____ as a nurse ____ a year A.works;since B.has worked; She left school three years ago and has worked as a nurse ev She left school three years ago and has worked as a nurse __ She left school 3 years ago and has worked as a nurse ever s she ( )as an animal trainer since 2003 用worked 还是has work ed I worked as a registered nurse in a private clinic in the la ( )does she work as a nurse?She likes to take care of people joan worked in a hospital as a nurse 阅读 Joan worked in a hospital as a nurse. She tried to serve others through her work as a nurse all he