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

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题目分析：
本题最需要注意的是在划线部分身前已经出现了一个so了，因此，由于“Lucy很小”和“很多人认为Lucy是其它血统”是因果关系，所以应该用so that连接。

选项分析：

A选项：so…that…结构不完整，划线部分缺少that。

B选项：Correct. 本选项在语法和逻辑上均是正确的。

C选项：宾语从句that they are of the same species需改为不定式短语to be of the same species，这点考查了不定式和从句的区别，用之于本题，显然presume是一个看法类动词，被动语态下身后应用不定式做宾语。另外，so that错误同选项(A)。

D选项：代词they没有指代对象；so…so that搭配错误。

E选项：代词they没有指代对象；so…that结构不完整。

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