OG-23

LIANGSHAN

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 fl ight 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.

本人菜鸟，求问，我选的B

LIANGSHAN

懂了，谢谢楼上~

fankser

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 fl ight 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
（本句中it指discus的重量的重量，而it应该指discus，而不是discus的重量，因为只有discus能被lined  with lead，discus的重量不可以。所以A错）
(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
（同A）
(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
（全句无谓语）
(E) The discus used in track competition was once
designed having its weight concentrated in a metal center and now.
（and前后不平行，而且表达也不太好）

LIANGSHAN

对，答案是C,  语法手册上说，因为it指代了weight，所以B错，整个句子到底是个啥意思呢，。。。。it应该指代谁呢？

xiangzhengj

答案C

catmice

正确答案是哪一个？