求助OG12-23语法

hstogether

23.In a previous design, the weight of the discus used in
track competition is concentrated in a metal center,
but now it is lined with lead around the perimeter,
thereby improving stability in flight and resulting in
longer throws.


(A)In a previous design, the weight of the discus
used in track competition is concentrated in a
metal center, but now it is

(B)According to a previous design, the weight of
the discus used in track competition was
concentrated in a metal center, but now it is

(C)Once designed with its weight concentrated
in a metal center, the discus used in track
competition is now

(D)The discus used in track competition, once
designed with its weight concentrated in a metal
center, but now

(E)The discus used in track competition was once
designed having its weight concentrated in a
metal center and now

答案是C，但是要是选C的话主语不就成了The discus了吗，这样不就跟原文的主语不一致了吗？谢谢！

calvinmonkey

原文的逻辑本来就是错的呀 怎么可能在重量的周围lined with lead 呢？而discus就可以了
不能只根据原文  要根据逻辑意思的

hstogether

感谢！

waytouing

请问是为什么呢？为什么weight 可以 concentrated 就不能lined with 呢？这两个不应该是对同意食物不同的方法解决吗？

waytousff

同意楼上，求解答。