请教CD语法笔记上一处不懂得解释

flonacui · 发表于 2012-11-1 23:50:47

CD Prep 2008语法笔记V2.02
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.

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(C)

E.The discus used in track competition was once designed having its weight concentrated in a metal center and now

(A)design固定搭配，没有design doing的结构；having concentrated 完成时使用没必要；后半句没有谓语动词，and now 应该为and now is 时态改变，因此不能直接并列，前半句使用的是过去时态was.

为什么时态改变不能直接并列？

maxmoon · 发表于 2012-12-5 14:36:14

看到得有点晚啊。。。

首先原句的主语是weight of the discus，那么就是weight，那么but后面的it就应该指代weight，也就是weight is lined。。。这意思就不对了。句子的主语应该是discus
所以要看CDE选项，D E比较像，先比较着看，
D选项错在这个句子整个没动词
E选项有动词，但是并列的从句and之后缺少和前一句对应的动词，所以并列成分错了。

回看C选项，虽然不是觉得特别好，但是语法和逻辑都没问题

请教CD语法笔记上一处不懂得解释

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