第24题: [单项选择]The riot is said ______ by the government’s negligence of the people’s welfare. A. to have been caused B. being caused C. to be caused D. to cause 参考答案:A 答案解析:[解析] sth./sb.is said to have done by…是一习惯表达法,表示过去发生的动作,相当于It is said that sth./sb.was done by…。类似的用法