OG2018 SC719 D选项求解

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题目： It is called a sea, but the landlocked caspian is actually the largest lake on Earth, which covers more than four times the surface area of its closest rival in size, North America's Lake Superior.
正确选项：Though called a sea, the landlocked Caspian is actually the largest lake on Earth, covering
D Though called a sea but it actually is the largest lake on Earth, the landlocked Caspian covers

OG解释说 D the structure here is grammatically incoherent. 想了解的是它是如何incoherent, 是代词问题吗？it 代词使用是必须前面有所指代的对象吗？

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Fiona09 发表于 2018-1-30 15:42
https://gmat.la/question/OG2016-SC-50 传送给LZ

谢谢！

Fiona09

https://gmat.la/question/OG2016-SC-50 传送给LZ