be faced with sth. 是个固定用法.前面的状语从句省略了be 相当于(when he was) faced with ...,he ...
我觉得要用Facing with啊,后面的he是face with such a difficult situation的主语啊,答案有时候不一定对.
意为面对，前面这个句子是个状语从句，主句是过去时，从句也只能用过去时，所以用faced with
