GWD一道语法题 谢谢看帖谢谢回帖啦

caiqiunan

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


D选项中的which能不能指代前面一整句话，我觉得也说得通啊。
答案是C

caiqiunan

求助啊

caiqiunan

ddddd

DUKB24

which只能指代名词

不能指代句子