She often goes to work___________.

问题描述:

She often goes to work___________.
A.by an underground B.by underground
C.by the underground D.take the underground

B
take 后面很多时候都是指搭乘什么交通工具.
而这里说by underground也可以是指通过地下路而已.不一定是坐地铁什么的