They go to school by underground里的by underground 划线,怎么提问

问题描述:

They go to school by underground里的by underground 划线,怎么提问

How do they go to school? 他们怎么去上学?
They go to school by underground.他们坐地铁去上学。
by underground=by metro=by subway 都是乘坐地铁的意思

How do they go to school?