为什么我们说面临时用faced with不用facing with

为什么我们说面临时用faced with不用facing with 为什么是faced with ,而不是 facing with facing.face with.be faced with. 关于be faced with 与 facing... 为什么是faced with difficulty be exposed to与be faced with,facing with 有什么区别和联系? 用when faced with造句! 用be faced with造句 用be faced with...造句 he was faced with difficulties为什么有with face be faced with be faced with sb