----- John looks a bit upset. Did you tell him the bad news?

------Yes, but I _____him after his birthday party.

A．should have told

B．must have told

C．shouldn’t have told

D．needn’t have told

侧重于反映工伤社会保险制度在保险基金形成过程中费用负担的公平性问题的是（）

A、补偿不究过失原则

B、补偿追究过失原则

C、差别费率原则

D、完整补偿原则