[求助]斑竹请进，关于如何确定比较和平行的对象

大全372.   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.

(D) small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remain（D）

(E) small mills, by processing steel scrap into a specialized group of products, have been able to put capital into new technology and remained

1）请问如何确定remain是和put并列，而不是和been able to并列？

大全528.       Never before in the history of music have musical superstars been able to command so extraordinary fees of the kind they do today.

(A) so extraordinary fees of the kind they do today

(B) so extraordinary fees as they are today

(C) such extraordinary fees as they do today

(D) such extraordinary fees of the kind today’s have（C）

(E) so extraordinary a fee of the kind they can today

2) 请问如何确定as后面的助动词是和been able to还是command并列？

大全456.       Joan of Arc, a young Frenchwoman who claimed to be divinely inspired, turned the tide of English victories in her country by liberating the city of Orleans and she persuaded Charles VII of France to claim his throne.

(A) she persuaded Charles VII of France to claim his throne

(B) persuaded Charles VII of France in claiming his throne

(C) persuading that the throne be claimed by Charles VII of France

(D) persuaded Charles VII of France to claim his throne（D）

(E) persuading that Charles VII of France should claim the throne

3）如何判定persuade是和turned还是liberating并列？

谢谢！

为什么没有人理我啊？