单项选择题
A．A good Mandarin. B．Good manners. C．Higher educational background. D．All of the abov
A．Hong Kong plays an important part in the trade between China and the world B．Cantonese is the official language of Hong Kong C．English is the mostly-used language in business D．Mandarin is as important as English in business
A．expert B．director C．foreigner D．English