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

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考题讲解

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)。

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