礼宾次序亦称礼宾序列。它主要适用于在多边性商务交往中如何同时兼顾（ ）、平等待人这两项基本礼仪原则，处于实践中难以回避的顺序与位次的排列问题。

A．尊重个人

B．尊卑有序

C．各国平等

D．以右为尊

—She was late for the party.

—That's () she had forgotten the exact time.

A. why

B. how

C. because

D. whether