选择题 _______such a difficult problem,he didn't know what to do.
A.Faced B.Facing C.Faced to D.Facing with 每个选项都有面对的意思,为什么选B
因为Facing such a difficult problem,he didn't know what to do.=When he faced such a difficult problem,he didn't know what to do.
选项A和C是过去分词,表被动,此句的逻辑主语是人he,选项D介词搭配错误.