The mobile River and its tributaries, which flow south to the Gulf of Mexico, form most important river system in Alabama.
觉着B和D都有问题,flow作为vt是"淹没"的意思,明显不符合句意;而作为vi需要加from,从而准确的表达 flow from... to ...
大家讨论一下,谢谢!
south adv. 向南方 eg. We travelled south for two days.我们向南旅行了两天。
d: --> form the most
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