请问一道2012年五月SAT语法题?

问题描述:

请问一道2012年五月SAT语法题?
After the most popular surfboard designer in the United States (retires,many surfers were convinced of having) no alternative but to ride boards of inferior design.
D)retired,many surfers were convinced that they would have
E)retired,many surfers were convinced of having
我用括号代替了下划线,为什么E选项不对?convince sb of doing sth/sth 使某人确信某事,这里用被动翻译得很通顺啊,而且比D选项简洁,为何它错了呢?

convince的用法的问题:
接从句:concince sb that 从句
convince sb.of sth.使某人相信某事
convince sb.说服某人
convince sb.by sound arguments 以理服人
convince sb.to do sth. 说服某人做某事
Sb be conviced of sth 某人认识到……某人相信……
至于你说的那个词组,convince sb.of doing sth.说服某人做了某事,不是确信的意思