prep 语法第226题 (GWD-3-Q1)

ykelly123

the four-million- old fossilized skeleton known as Lucy is so small compared with many other skeletons presumed to be of the same species, and so some paleontologists have argued that Lucy represents a different lineage.

A. presumed to be of the same species, and so
B. presumed to be of the same species that
C. presumed that they are of the same species, and so
D. that they have presumed to be of the same species, so that
E. that they have presumed are of the same species, and

正确答案是B
我当时排出A是因为觉得and so不可以，可看了笔记说可以，排A是因为so..that的结构不完整。
我想问的是，比起...so adj that....that这个结构，为什么A不能看成是 主谓宾+so连词连句子 这个结构？

有什么想法说说阿
谢谢！

onlysilence222

我这个题选的就是A，我就不懂了~~求大神解答