以下哪个功能实体用来实现IMS核心控制面与PSTN或CS的交互功能？（）
A.SLF
B.BGCF
C.MGCF
D.IM-MGW
参考答案：C
The fire the death of twenty persons was caused by his carelessness.
A．resulted in
B．resulted from
C．resulting in
D．resulting from
公关人员处理公众的一般性投诉时，应与公众一起表示对组织的不满。
