一盏弧光灯的额定电压是40 V，正常工作时的电流是5A，如何把它接入电压恒为220 V的照明电路上，使它正常工作？

The British are not so familiar with different cultures and other ways of doing things, ___________ is often the case in other countries

A．as

B．that

C．so

D．it