搜题，就来89问答库Since rail network is not as extensive as highway network in most countries and its limitation to fixed track facilities, as a result, railroads provide （） service.
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Since rail network is not as extensive as highway network in most countries and its limitation to fixed track facilities, as a result, railroads provide （） service.
- A: Door to door
- B: Door to cy
- C: Door to cfs
- D: Terminal to terminal
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