on a train 和in a train哪个是对的啊哪个是乘火车啊

问题描述:

on a train 和in a train哪个是对的啊哪个是乘火车啊

on a train,这是固定的词组!

坐火车不是by train嘛?

neither,it should be ride a train
若果必须要选的话:on a train

on the train