搜题，就来89问答库（）are respectively the dominant transport mode in China and in the United States.
1 阅读
（）are respectively the dominant transport mode in China and in the United States.
- A: Rail and motor
- B: Motor and rail
- C: Rail and rail
- D: Water and rail
请帮忙给出正确答案和分析，谢谢！
用心做一件事，就一定会收到赞赏
验证码：124807