一选择题

D

名词 (pl. occupations)
工作,职业
He is a bus driver by occupation. 他的职业是公车司机。
消遣;日常事务
He was bored for lack of occupation. 他因无所事事而感到厌烦。
占领,占据;占领时期
The Japanese occupation of Taiwan lasted fifty-one years. 日本占领台湾达五十一年之久。
占用;居住;占用(或居住)期
No one is yet in occupation of the house. 这所房子还没有人住进去。
英语字典
occupation ['ɒkjʊp'eɪʃən]

Your occupation is your job or profession.
An occupation is something that you spend time doing, either for pleasure or because it needs to be done.
The occupation of a country happens when it is entered and controlled by a foreign army.

这里表工作.平常做什么

C D都是表职业 他是做什么的 你只能说他是交通警察

C，D指的是职业 而business指的是职责 翻译过来是：作为一名警察，他的职责是。。。