The steel industry has changed radically

percentile99

如果用conduct作后置定语那也只能用conducting而不是conducted，而且用了后置定语就变成修饰Bethlehem Steel了，句义上不如修饰 large, integrated companies 好

emmalululu123

我的解题思路：
这个句子pattern 是gmat常有的，搞一堆有的没的描述在扰乱视线，要注意找出句子骨干。
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.
然后再看怎么把修饰语合理地加进去。
A. as large, integrated companies such as Bethlehem Steel  once conducted operations from mining at one end of the process to shipping at the other, 这个修饰语是拿来修饰Bethlehem Steel的，要用that 来连接一下。
B. as large, integrated companies, such as Bethlehem Steel, that
C. with large, integrated companies, such as Bethlehem Steel, that ”with“不能加一个句子
D. while large, integrated companies, such as Bethlehem Steel, that  "while‘表转折意思，句意不符
E. and large, integrated companies such as Bethlehem Steel "and"连接俩平行句式或承接作用，句意不符