He can't visit his aunt this week. He           go to the doctor. [ ]

A. have to

B. has

C. has to

网上银行风险管理从属性上分主要包括哪两方面？（）

A、网络安全和资金安全

B、操作安全和证书安全

C、密码安全和空白证书安全

D、技术安全和业务安全