GWD 20-17

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

这题应该是B,因为当中的句子是插入句，并且有2个谓语conducted 和have downsized.A,E缺that,一句句子2个谓语错。C用with,那么have downsized要用非谓语，错。D表示转折，错。

问一下楼主，GWD20楼主是那里找到的？？

在网上看到你发帖子问gwd 20-30的题目，觉得很疑惑。我搜遍所有版区下载了1-13，17，18，19，21，24，28，31，但实在没有找到gwd 20-30.

请问除了我上面说得到底还有几套可以下载，能麻烦给个链接吗，或者把你另有的题目传一份到我的邮箱wangxiao668(A) hotmail.com

马上也要考试了，着急呀！对你的帮助感激感激！

Why not A. The purpose of the sentence is to compare

The steel industry has changed radically, as xx companies (once conducted operations ... at one hand...at the other) have greatly downsized, or ...shut down.