when we are faced with the problem,.为什么用faced,而不是 facing?
问题描述：
when we are faced with the problem,.
为什么用faced,而不是 facing?
答
face 是及物动词，需接宾语，你可以说we face the problem，也可以说we are faced with the problem。
答
be faced with
面临
固定用语
答
可以理解为被动用法,be faced with the problem被问题面对,就是面对问题的意思.
答
are faced with固定结构 面对。。。