求教GWD-4-Q17

kudoucliff

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.

as large, integrated companies such as Bethlehem Steel
as large, integrated companies, such as Bethlehem Steel, that
with large, integrated companies, such as Bethlehem Steel, that
while large, integrated companies, such as Bethlehem Steel, that

and large, integrated companies such as Bethlehem Steel
这题答案是B，D为什么不行啊？文中也存在对比关系啊。。。

haonan15110

while 有转折的意思，违背原题意