求问GWD4-17关于A选项新的疑问

alexisqyj · 发表于 2012-3-27 19:39:29

求问GWD4-17关于A选项新的疑问
The steel industry has changed radically over the last two decades, as large, integrated companies such as BethlehemSteel 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 BethlehemSteel
as large, integrated companies, such as BethlehemSteel, that
with large, integrated companies, such as BethlehemSteel, that
while large, integrated companies, such as BethlehemSteel, that
and large, integrated companies such as BethlehemSteel
已理解b的正解，但对A还是有疑问，为什么不能把once conducted operations from mining at one end of the process to shipping at the other 当做过去分词作定语呢？如果这样的话，不就比从句要简洁了么？难道是因为这里有一个once?

alexisqyj · 发表于 2012-3-27 19:43:04

呃.......刚发完贴我就明白过来了，可是不知道怎么删帖，忽略我这个白痴问题吧~~~~~~A错的罪该万死。。。。。。。。。。

求问GWD4-17关于A选项新的疑问

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求问GWD4-17关于A选项新的疑问