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题库 / Prep2008E1-SC-182
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.
using Web sites, public meetings, and also mass mailings—that have convinced
using Web sites, public meetings, and mass mailings—that has convinced
by using Web sites, public meetings, and mass mailings—in convincing
by the use of Web sites, public meetings, as well as mass mailings—that convinced
which used Web sites, public meetings, and mass mailings—in convincing
题目分析：
破折号中的using Web sites, public meetings, and mass mailings是插入语，不影响主干结构，因此本题的主干为：
The organic food industry has organized a successful grassroots campaign that has convinced the Department of Agriculture
选项分析：
A选项：定语从句that have convinced the Department of Agriculture的先行词应为a successful grassroots campaign，即，这个草根运动劝服了the Department of Agriculture。因此，由于campaign是单数，所以应将have convinced改为单数动词has convinced。另外，also是副词，表示“也”，和并列连词and之间在语意上重复。
B选项：Correct. 本选项在语法和逻辑上均是正确的。
C选项：介词短语in convincing the Department of Agriculture需改为定语从句 that has convinced the Department of Agriculture。这是因为，介词身后只能是动名词短语，而动名词短语在字面上没有主语。例如，我们说，a bag for sleeping，这个词的意思是，睡袋。这完全不等同于a bag that sleeps（一个bag没法睡觉）。在本题语境下，发出convince这个动作的肯定是a successful grassroots campaign，即，草根运动劝服了政府，因此必须用定语从句。
D选项：并列连词and不能换为as well as，as well as使mass mailings与前两项变为从属或递进关系，而在逻辑上，网站，公众集会，广发邮件应是单纯的并列关系。
E选项：介词短语in convincing the Department of Agriculture错误同(C)。
C by using不行；in convincing不行
【主句+ by doing】这个结构用by doing 解释主句如何发生
例如 i prepared for the test by reviewing takeaways on the MGMAT forums. 看论坛解释了我如何准备考试
C选项：’using Web sites, public meetings, and mass mailings" 没有解释 “如何oranize campaign“，因为 campaign本身 = use Web sites, public meetings, and mass mailings
using和by using修饰的对象不同：by using A, B, and C修饰的是如何organize；而using A, B, and C修饰的是grassroots campaign。+by改变了原句的意思。
【主句 + in doing】主句里的谓语动词 必须是 doing的一部分，
例如i solved all the problems in OG12 in preparing for the GMAT.
解决问题solved 是 准备preparing GMAT的一部分。翻译为【在这件事中】。
C选项：organize是后面convincing的一个动作，逻辑不合理
The organic food industry has organized a successful grassroots campaign—[using] Web sites, public meetings, and mass mailings—[that has convinced] the Department of Agriculture to change the proposed federal regulations for organically grown food.
有机食品行业组织了一场成功的草根运动——利用网站、公开会议和群发邮件——说服了农业部改变拟议中的关于有机种植食品的联邦法规。
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