"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 at work for work as用法和区别 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 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 和 work at 有什么区别? work on,work in,work at work for,work as怎么用 要例句 work on和work with和work to有什么区别? work on something和as to译成中文as to the topic,I'd like to work on language skill work out 和 work on 的区别 work at和work on和work out的区别 work on work out有什么区别 at work,in work,on work 有什么区别? work on与work work in/at/as/on/with/out function as 和 work as 的区别 work on to do和work on doing有这种说法吗?和go on to do ,go on doing work on,work out,work in work to有什么区别求大神帮助 work on 和 work in 的用法及区别.请说详细些,最好有例句.