Lucy,could I use your computer?Sorry,I'm going to _____ now.A：work at it B：work it at C：work it on D：work on it（告诉语法啊）

D
不要什么都用语法解释，多背多读培养语感好了。
很多就是习惯表达

选C啦
动宾短语，当用it作为宾语时，it要放中间，这是规定的。
所以先排除A / D
接下来考动词短语搭配，work on 从事于，，继续做某事，所以答案出来了，

选D. work on 在这里不是做一个短语来解释的。应该是i am going to work,在什么地方work呢，on the computer,那么由于the computer前面已经提及过，所以这里用it来指代the computer，所以是work on it。而我们不说work at a computer。

选D，是一般将来时

D：work on it
怎么解释呢,work on从事
没有work at这个短语啊

D
work on
从事于，致力于
work on / [work on sb/sth] phr v 1 to spend time working in order to produce or repair something
例：He has spent the last two years working on a book about childcare.
Every weekend you see him working on his car.
2 to try very hard to improve or achieve something
例：A trainer has been brought in to work on her fitness.
work at [work at sth] phr v to try hard to improve something or achieve something
例：Learning a language isn't easy. You have to work at it.

1、work at从事于……；致力于……
work on影响，对…起作用；继续工作；从事于…；设法说服
2、这个题不是考词组，是考介词
at prep. 在（表示存在或出现的地点、场所、位置、空间）；以（某种价格、速度等）
on adv. 向前地；作用中，行动中；继续着
prep. 向，朝……；关于；在……之上；在……时候
adj. 开着的；发生着的，正在进行中
3、选D.
在电脑上工作即work on the computer
在工厂工作即Work in the factory