题目选项分析

The organic food industry has organized a successful grassroots campaign-by the use of Web sites, public meetings, as well as mass mailings-that convinced the Department of Agriculture to change the proposed federal regulations for organically grown food.

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.