Questions

softcc

Archaeologists in Egypt have excavated a 5,000-year-old wooden hull that is the earliest surviving example of a "built" boat--in other words, a boat constructed out of planks fitted together--and that thus represents a major advance, in terms of boat-building technology, over the dugout logs and reed vessels of more ancient vintage.

• Atogether--and that thus represents
• Btogether--and this has represented 分析该选项
• Ctogether, and it represents 分析该选项
• Dtogether that was representing 分析该选项
• Etogether to represent 分析该选项
  

Answer is A, why is not C?

Fiona09

C项中and连接了两个独立的句子，在语法上应该与主句（Archaeologists in Egypt have excavated...）平行

但从逻辑意思上讲，这里应该是要与定语从句that is...并列的。

IWANT750

it能指代的东西太多了,不知道指代的是哪个.
破折号后面是解释说明前面的东西. ,and可以被看成是这个解释的一部分(因为是逗号不是句号),但是真正句意上不是这个意思.