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
这道题答案为C 我选择了B。
是不是这里用According to 的问题？我感觉B时态和结构都可以接受。
清楚了~几个单词不熟造成理解困难。谢谢
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