When did you become a sales executive--Translate to Mandarin.

问题描述:

When did you become a sales executive--Translate to Mandarin.
Which is correct?
1)When did you become a sales manager.
2)When did you become sales manager
--Translate to Mandarin.
Answer:
1)你几时成为销售经理.

第一个对,成为一个什么人要加冠词