建议你看看OG12 42题，B选项的解释 the ostensible parallel ... is superficial....
英语里面几乎不会把be和do平行，比如不会说：
I was a business woman and ran my own company. (awkward)
要平行，就是：
I was a business woman and a enthusiastic traveler.
I ran my own company and traveled around the world.
当然这只是我感觉，不敢100% sure
至于这道题，你注意语义
Small mills, by (some methods), have been able to put ___ and remain ____.
符合逻辑。
如果按你所说的平行：
Small mills, by (some methods), have been able to put ___ and remained ____.
从意思上看，(some methods) enable small mills to remain ____. So you should explicitly point out the meaning of "enabling". This is the reason that you need to keep the "remain ___" part parallel to the "put ___" part.
正确： in contrast to large plants that take iron ore through all the steps needed to produce several different kinds of steel, small mills, by processing steel scrap into a specilized group of products, have been able to put capital into new technology and remain economically viable. 错误： small mills, by processing steel scrap into a specilized group of products, have been able to put capital into new technology and remained
两个选项不同之处在于remain 和 remained
OG解释： been able to put....and remain...
但是，就算我理解成 have been able to put....and (have) remained...有什么错呢？
-- by 会员 mliu9 (2012/2/11 4:35:01)
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发表于 2012-2-11 04:35:01
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发表于 2012-2-11 14:38:49
