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.
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ABy the same techniques used for genetically enhancing plants, making them
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BWith the same techniques to genetically enhance plants, so that they are
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CEmploying the same techniques used to genetically enhance plants so that they are
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DEmploying the same techniques to genetically enhance plants, which makes them
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EEmploying the same techniques for genetically enhancing plants that make them
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正确答案: C