By the same techniques used for genetically enhancing plants, making them disease- or pest-resistant, researchers have been able to increase the amount of protein in potatoes, sweet potatoes , and tobacco. A. By the same techniques used for genetically enhancing plants, making them B. With the same techniques to genetically enhance plants, so that they are C. Employing the same techniques used to genetically enhance plants so that they are　 D. Employing the same techniques to genetically enhance plants , which makes them E. Employing the same techniques for genetically enhancing plants that make them 查到原句：But researchers have been working on bolstering the protein quotient of plants, using the same techniques that genetically enhance plants to make them disease- or pest-resistant. 这题在C和E之间争 我个人选 因为我整个不能苟同C里面的so that（不是表结果就是表目的） 就算so that说的通(因为之前被用来这样用所以以致於他是........) 那怎麽知道他这边的they没有修饰歧义的问题（指techniques or plans) 再来就是E 其实我觉得for genetically enhancing这个ing很不顺眼 CD上说如果这边的that修饰techniques，那麽them指什麽？ 我的问题是 难道跳过for genetically enhancing plants之後修饰techniques 後面的代名词then就不能指代跳过的东西？ by the way,原句也和E比较相似 对巴 再来就是 同一个句子里面，代名词究竟是「就近指代」还是「优先代替原题主词」？ 恩~~ 其实评比之後我会同意选C 只是还是有这些小疑问 希望提出来和大家一起讨论........ --

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