---I am sorry. I should not have been so rude to you.

--- You _________ your temper but that’s Ok.      

A．have lost

B．had lost

C．did lose

D．were losing

假设商业银行当年将100个客户的信用等级评为BB级，第二年观察这组客户，发现有3个客户违约，则其（）为3%。

A.违约概率

B.违约频率

C.不良债项余额在所有债项余额的占比

D.违约损失率