21,26,23,24,25,22,27,()A.28 B.29 C.20 D.30 发布时间:2017-06-28 13:07 │ 来源:www.tikuol.com 题型:单项选择题 问题: 21,26,23,24,25,22,27,()A.28B.29C.20D.30