By the same techniques used for genetically enhancing plants, making them disease-or-pest resistant, researcher 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 选d么?这里的which指代的不是句子吧,前面的 Employing the same techniques to genetically enhance plants,是现在分词做伴随状语吧??所以说不算指代句子是么??
谢谢!!
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