再问大全133--谓语单复数问题

1.        As part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling during the 1950s, so that they could learn to fall without being hurt.

(A) As part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling during the 1950s

(B) As part of their therapy, young polio victims learning to live during the 1950s with their disabilities were helped to practice falling

(C) Young polio victims learning to live during the 1950s with their disabilities were helped to practice falling as part of their therapy

(D) Young polio victims learning to live with their disabilities were helped to practice falling during the 1950s as part of their therapy（E）

(E) During the 1950s, as part of their therapy, young polio victims learning to live with their disabilities were helped to practice falling

还有一个问题，我想请教一下这句话的主语；一直以为这句话的主语是young polio victims learning to live with their disabilities 那么，照这样来看，后面的谓语动词似乎应该用was才对，为什么ABCDE中间都是were呢？

谢过先