OG12-23求助

幸运E枪兵

In a previous design,the weight of the discus used in track competition is concentrated in a metalcenter, but now it is lined with lead around the perimeter, thereby improving stability inflight and resulting in longer throws.
A.    In a previous design, the weight of the discus used in track competitionis concentrated in a metal center, but now it is
B.    According to a previous design, the weight of the discus used in trackcompetition was concentrated in a metal center, but now it is
C.    Once designed with its weight concentrated in a metal center, the discusused in track competition is now
D.     The discus used in trackcompetition, once designed with its weight concentrated in a metal center, butnow         (C)
E.    The discus used in track competition was once designed having its weightconcentrated in a metal center and now
答案选a. 我想知道为什么it在这里不能指代weight of the discus？

macao417

答案不是c吗

anyany024

显然不能，it指代的一个常用logical判断是把指代对象带回it看看句子逻辑上是否合理

重量被lined 显然是illogical的

幸运E枪兵

up~~~

幸运E枪兵

up~~~