12. Mr. White works with an import and export company, but he ______ for this industrial fair, since he is on leave.

A．has worked

B．works

C．has been working

D．is working

货物（）是指承运人在规定的地点与收货人进行货物（车）交接后，并在货物运单上加盖货物交付日期戳记，即表示货物运输过程终止的作业程序。