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D项带入后是：
The discus used in track competition, once designed with its weight concentrated in a metal center, but now lined with lead around the perimeter, thereby improving stability in flight and resulting in longer throws.
once designed with its weight concentrated in a metal center如果是做插入语则没有谓语
而且如果大家都不懂这句话里面的单词，就是只从语法角度分析，lined的修饰对象会不会引起歧义呢？是discus还是its weight 。。。？反正如果我不懂单词的意思我真的会搞不清
反正怎么看怎么错 |
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发表于 2010-4-4 23:35:40
