比较常用的数据挖掘方法有3种：______、分类分析及聚类分析。
参考答案：关联规则挖掘
解析： 常用的数据挖掘方法有关联规则挖掘、分类分析、聚类分析。
-----I haven’t seen Gina for a week.
-----Oh! She _______ Mt. Huang with her friends. She ________there twice.
A. has gone to; has gone B. has gone to; has been C. has been to; has been
She＿＿＿＿＿＿＿＿the film. She knows nothing about it.
A．can’t see
B．can’t have seen
C．must see
D．mustn’t have seen
