出卷网(Chujuan.Net)为中小学教师出题组卷参考：月考试卷、模拟试卷、期中期末试卷

On the Double Ninth Festival, many old people will get together, talking about the people and the things ________ they came across many years ago.
A. what                                                          B. which
C. who                                                           D. that