英語三級每日口語(2.24)：Do you know his background?

Do you know his background?
    你了解他的背景嗎？
    今天的幾個句子是有關工作的：
    1.Which department do you work for?你在哪個部門工作？
    2.How long have you been doing that job? 這個工作你做了多長時間了？
    3.How long does it take (you) to commute? 上下班路上要花多長時間？