ttgwd30-17,没搜到这题

Q17:

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.

1. By the same techniques used for genetically enhancing plants, making them
2. With the same techniques to genetically enhance plants, so that they are
3. Employing the same techniques used to genetically enhance plants so that they are
4. Employing the same techniques to genetically enhance plants, which makes them
5. Employing the same techniques for genetically enhancing plants that make them (c)

这里b为什么不正确，c中的employing 。。。used不会产生重复吗？

they 的指代不会有什么歧义吗？

不好意思，刚刚找到连接

http://forum.chasedream.com/dispbbs.asp?BoardID=23&ID=154664&replyID=1450548&skin=1

但是有些问题还是没有解决，还是不太懂b和c中的so that有什么区别，还有c中的used产生重复的现象！！

c中的used 是修饰前面的techniques的吧

那位高人  给以个看法

我选的是D D中的which指代techniques行么？

to do比for doing好 that跳跃修饰techniques么？

D 不行， which 指代不明。

C： Employing the same techniques (which are) used to genetically enhance plants so that they are ...

没有重复的问题。

应该不行，因为which后面是makes，而techniques是复数，单复数不一致

GWD30-Q17: 

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.

1. By the same techniques used for genetically enhancing plants, making them

2. With the same techniques to genetically enhance plants, so that they are

3. Employing the same techniques used to genetically enhance plants so that they are

4. Employing the same techniques to genetically enhance plants, which makes them

5. Employing the same techniques for genetically enhancing plants that make them

ANS: C

个人认为, choice D 中的
            which 无法指代employing …….这整句话,
                

题目说的是 employing………..这整件事使得他们
            disease- or pest-resistant
                

而非 technologies 或是 plants 让他们
            disease- or pest-resistant.
                

所以D 的
            which 用法错误.
                

而C 中的plants, 个人认为是指 plants
            

Open to discuss ~