work on和work as有什么区别,应如何运用那与work at如何区别

work on和work as有什么区别,应如何运用那与work at如何区别 work on 和work at 和 in 有什么区别? work on 和 work at 有什么区别? work on work out有什么区别 at work,in work,on work 有什么区别? work on和work with和work to有什么区别? work on work at work for work as用法和区别 work as和work on有什么区别?有这样一个选择题:My sister_____ a policewoman.A.work as B.works asC.works onD.work on我觉得答案是B,可参考答案上是D,为什么? work on,work out,work in work to有什么区别求大神帮助 work on may letter和work at my letter都可以吗,有什么区别 work out 和 work on 的区别 work at和work on和work out的区别 finish work 和finish the work 有什么区别呀? 英语for work和to work 有什么区别? work hour load 和 work hour 有什么区别? function as 和 work as 的区别 job和work有什么区别 task work和job有什么区别