From his _______ look, we could see that he hadn’t expected that we could raise such _______ questions to him.

A．confused; confusing

B．confusing; confused

C．confusing; confusing

D．confused; confused

被叫侧业务。当被叫侧网络不能确认主叫号码的情况下，或主叫以匿名身份向被叫发起呼叫时，被叫AS可以主动选择拒绝接听来电，并给主叫响应一个错误消息，以提示被叫拒绝主叫发起的匿名呼叫。