82. In contrast to large steel plants that take iron ore through all the steps needed to produce several different kinds of steel, processing steel scrap into a specialized group of products has enabled small mills to put capital into new technology and remain economically viable.
(A) processing steel scrap into a specialized group of products has enabled small mills to put capital into new technology and remain
(B) processing steel scrap into a specialized group of products has enabled small mills to put capital into new technology, remaining
(C) the processing of steel scrap into a specialized group of products has enabled small mills to put capital into new technology, remaining
(D) small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remain
(E)small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remained
remain这个词作为"保持"解释是不是不可以有完成时态?象E中的错误.
请NN确认一下.
这样就在判断答案时起码又多了一个标准.
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