第23题: [单项选择]Now ______ of students has reduced because ______ of students have graduated recently. A. the number; number B. number; a number C. a number; the number D. the number; a number 参考答案:D 答案解析:[分析] 句意:现在学生人数已经减少了,因为很多人已经毕业了。the number of sth.做主语时因为其中心词number为可数名词的单数形式,所以谓语动词要用单数形式;a number of