关于and连接的语法题

Xiaotongdi

The steel industry has changed radically over the last two decades, as large, integrated companies such as Bethlehem Steel once conducted operations from mining at one end of the process to shipping at the other have greatly downsized, or in some cases shut down altogether.

A. as large, integrated companies such as Bethlehem Steel

B. as large, integrated companies, such as Bethlehem Steel, that

C. with large, integrated companies, such as Bethlehem Steel, that

D. while large, integrated companies, such as Bethlehem Steel, that

E. and large, integrated companies such as Bethlehem Steel

B，难道不用and连接？

Kb24

前半句讲的是steel industry，后面是steel industry 里面的大型公司们，不是并列关系。后半句用具体事例来描述The steel industry has changed radically over the last two decades，所以不是平行关系，不用and。 E里面最后也没有逗号也没有that，形成的句子也是结构错误的，一口气读下去窒息而死。。。。。

Xiaotongdi

哦哦哦……明白了！这么说as是作为举例的词咯？
因为后面连了一个such as，我做题比较快的时候就摸不着前后了！你读这题是把意思都出来了吗？还是靠语法？

Kb24

还是要看一下意思的，因为GMAT语法好像越来越多题目要考到句子的逻辑意思了 （白勇大侠N年前就讲到这个趋势）
陷阱好像也多起来了，悲催的。。。。