face be faced withThe world economy has picked up

网友回答

不是被动关系,而是主动的,即major problems and challenges能发出 face 这个动作.
被动的是这样：many developed countries are faced with major problems and challenges
其实,face 作动词时,用法挺特别的.（以下截图来自剑桥在线）
face be faced withThe world economy has picked up ________since the crisis at the end of last year,but major problems and challenges_______many developed countries are not fully solved.Asomehow; faced(图1)