求问 新prep 182题

debbiebeansky

The organic food industry has organized a successful grassroots campaign—using Web sites, public meetings, and also mass mailings—that have convinced the Department of Agriculture to change the proposed federal regulations for organically grown food.
A. using Web sites, public meetings, and also mass mailings—that have convinced
B. using Web sites, public meetings, and mass mailings—that has convinced
C. by using Web sites, public meetings, and mass mailings—in convincing
D. by the use of Web sites, public meetings, as well as mass mailings—that convinced
E. which used Web sites, public meetings, and mass mailings—in convincing


我选的是C,但是答案是B
我没懂为什么不能用by using? 还有，是因为原文用定语从句修饰campain，所以in convincing做状语修饰前句改变了原文意思，所以不能选么?


求大牛们解答啦~~先谢谢了！

mba2013

using Web sites, public meetings, and also mass mailings
是用来修饰CAMPAIN 相当于CAMPAIN的同位语 当然不需要介词
如果把2个“-”去掉，就可以加上BY
至于后面说的
GMAT考试倾向于使用that从句 而不是介词短语的形式。THAT从句简洁流畅
希望没有误导你。。。

huosijie

推楼上的解答。我也觉得using Web sites, public meetings, and also mass mailings 就是指grassroot campaign 本身了，而by一般后面接续的是方式，这里是同位语。

另外我觉得in convincing也不是很通顺，如果是我写这个句子，大概倾向于用to convice，来表示一个目的。

debbiebeansky

谢谢啦prep的解释上说 “By using逻辑含义上不等于using，其表达的是因为通过那三个方式草根运动才是成功的，这个含义不对"我在琢磨琢磨吧