请教OG48

appletutu

48.
The golden crab of the Gulf of Mexico has not been fished commercially
in great numbers, primarily on account of living at great depths--
2,500 to 3,000 feet down.

(A)    on account of living

(B)    on account of their living

(C)    because it lives

(D)    because of living

(E)    being they live

答案是C没有疑问，但是我不明白D答案为什么不可以选，OG上这么解释：

Choice
D, like A, fails to provide a noun or pronoun to perform the action of living, but even with its the phrases would be more awkward
and less clear than it lives

我认为主句中的GOLDEN CRAB就是LIVING的主语，而且这样 表达比C更简洁，为什么不选择D?

请NN帮我解答一下，谢谢！

amacd

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=100763

roric

与lz有同样的疑问，并且楼上的连接里没有相关答案阿