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
这个题正确答案C 一直对for doing不太理解,我想问这里是不是不能够for genetically enhancing 来形容techniques,也就是说没有这样的用法, that 是不是也不能跳跃修饰到techniques
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