我也错选了D。 回过头，反复读一下D发现designed with its weight concentrated 是被动语态的，discus应该是被designed而不是designed with its，这里的it指代discus，所以D这样用就不对了。 如果将once designed with its weight concentrated in a metal center看成修饰，那么前半句话就不完整（没有谓语），所以D还是不对的。
若把D放入原句The discus used in track competition, once designed with its weight 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.
就变成了 the d, once.... ,but now it is lined... 红色的那部分就是d的同位语了，句子主线成了 the d but now it is lined 就不是一个主句，一个分句了，而变成了一个有两个主语的句子，显然错了
首先，discus 铁饼的意思，track competition 田径赛 weight 中心 还有一短语更是没想到 line with，来自Longman词典；line [transitive] 1 to sew a piece of material onto the inside or back of another piece to make it stronger or warmer: Are those curtains lined? line something with something a leather coat lined with silk 2 to form a layer over the inner surface of something: The birds use small leaves for lining their nests. line something with something The cage should be lined with straw. 3 to form rows along the sides of something: Crowds lined the route to the palace. be lined with something The street was lined with small shops. a tree-lined avenue 华丽丽的一道看着熟悉的单词 就是不懂意思的sc啊
首先说 ，14楼给出的句子不对，加入D没有it is，所以14楼说的变成了一个有两个主语的句子我感觉是不对的，但是如果把, once designed with its weight concentrated in a metal center, 看做插入语，那么句子就成了 The the discus used in track competition but now lined with ，还是可以成立的，只是说这里的but后省略了相同的主语，但是这里的转折就有点奇怪了，曾经用于在比赛里但是现在怎么怎么，意思上就奇怪了，所以我认为D是没有语法错误的，错就错在这个转折。
sorry 小弟好像不會弄字的顏色 以下是我的淺見 A. In a previous design, the weight of the discus used in track competition is concentrated in a metal center, but now it is
it 指的應該是the weight of the discus 所以是贅字
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
according 不與but 連用 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
這個選項我發現.....好像沒動詞 used ...designed but ....lined E. The discus used in track competition was once designed having its weight concentrated in a metal center and now
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发表于 2009-10-12 09:12:00
