182. (32026-!-item-!-188;#058&006326) B 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
这道题里面的THAT丛句是不是多余, 该怎么来理解呢,该不该用IN CONVINCING 在这里呢,请教大家
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