gwd4-1

我是一条鱼

The four-million-year-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.

presumed to be of the same species, and so

presumed to be of the same species that

presumed that they are of the same species, and so

that they have presumed to be of the same species, so that

that they have presumed are of the same species, and

请问为什么是选B? 讨论里好象也没有这道题.如果有请给个连接.如果是没有请帮忙解释一下,谢谢各位NN

joe11

Here you go.

http://forum.chasedream.com/dispbbs.asp?boardID=23&ID=71656&page=1