题目内容
(请给出正确答案)
[主观题]
Currently, different types of multimodal transport operation involving different combinations are ta
king place.( ) is one types of multimodal transport operations but not involving rail.
A. Land bridge B. Air/Sea C. Sea train D. Piggyback
![](https://lstatic.shangxueba.com/sxbcn/h5/images/tips_org.png)