是否也有人和我一样深深纠结与此问题！！！

lurenyizcs

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

根据比较原则，比较对象要可比，直接排除A,B,C
D和E的差别就在最后的那个动词，remain的形式    
答案是D，其解释为：small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and (have been able to) remain    如此的一个省略，此时remain与put两个动作并列！！

而我纠结的是，以下几种省略错在哪里？？？？？
1：  small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and （have）remained     如此的一个省略，此时remained与been able to put两个动作并列！！
2：  small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remain          此时remaine与 have been able to put两个动作并列！！（虽然形式和正确答案的解释是一样的，但是思考的却是根本不一样）

期待牛人帮忙解答~~~~~~~~~~~

lurenyizcs

顶上去先！！！！！

mycontrol01

small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remain          此时remaine与 have been able to put两个动作并列！！（虽然形式和正确答案的解释是一样的，但是思考的却是根本不一样）

这个 一个完成时一个现在一般时 当然错了


按句子逻辑意思理解吧  句子是想说在使用新技术的同时保持经济性 所以remain要在to之后与put平行   参考A选项意思吧 A的意思80%的时候都是对的 无法判断时就看A