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.
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
答案为C,OG的各项解释我也明白,我的问题是,假设有这样一个选项
(F) The discus used in track competition was once designed with its weight concentrated in a metal center, but now it is
首先, 你要搞清楚一个概念. 复合句比简单句并列简洁 几个不能算是原则的参照吧: 复合句比简单句堆叠简洁 如 I have a dog, and he likes to go out for a walk. 就不如I have a dog that likes to go out for a walk.
短语比从句简洁 如 My dog likes to go out for a walk when he finishes dinner. 不如,分词结构 Finishing dinner, my dog likes to go out for a walk. 或者 独立主格 Dinner finished,my dog likes to go out for a walk