【题目】A lot of policemen were sent there to ____ the football fans from making trouble.
A. permit B. prevent C. protect D. prove
在线课程【答案】B
【解析】
试题分析：考查动词。句意：一些警察被派到那儿防止足球球迷们制造麻烦。Keep sb doing sth 让某人一直做某事；prevent /stop sb （from）doing sth阻止某人做某事；keep sb from doing sth 阻止某人做某事，故答案选B。