题目选项分析

The steel industry has changed radically over the last two decades, as large, integrated companies, such as Bethlehem Steel, that 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.

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.