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.

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

请教这题为什么要用完成时态？ D为什么不好？ 难道因为as well as不如and好吗？

这道题选B吧

题目原句用的现在完成时，除非句子中有明显的时间标志，否则不要改变原句所用时

态

而且by the use of 用法也不对, 动作的发出者The organic food industry ，所以

用using

这道题用3/2原理，有两个判断很关键

in convincing还是that

by using还是using

是否in doing无法表目的？还是说convince的主语一定是campeign?否则无法排除 inconvincing

后面一个判断完全没方向...