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题库 / Prep2008E2-SC-160
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
According to a previous design, the weight of the discus used in track competition was concentrated in a metal center, but now it is
Once designed with its weight concentrated in a metal center, the discus used in track competition is now
The discus used in track competition, once designed with its weight concentrated in a metal center, but now
The discus used in track competition was once designed having its weight concentrated in a metal center and now
题目分析：
略。
选项分析：
A选项：通常，代词的指代对象应是名词词组的核心词。因此，本选项中it的指代对象为weight of the discus，这在逻辑上是有问题的。真正在周边放上铅的应该是discus，而不是discus的重量；另外，is concentrated应改为was concentrated，划线部分给出了明显的过去时间in a previous design。
B选项：介词according to措辞有误，according to的意思是“根据”，我们不能说，“根据过去的设计，质量怎么怎么安放”，而应该说，“在过去的设计中，质量是怎么怎么安放的”。
C选项：Correct. 本选项在语法和逻辑上均是正确的。once designed with its weight concentrated in a metal center是伴随状语，其主语为the discus。
D选项：全句缺少谓语动词。
E选项：并列连词and身后缺少谓语动词。
A. it指代the weight of the discus，但是lined with lead应该是discus
B. 同A
C. right
D. but后面句子不完整，跟前面成分平行后依旧不完整
E. and后面句子不完整，与前面成分无法构成平行
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