_____ in the dark, his head hit against a tree.
A. Walking B. He was walking
C. Walked D.When he was walking
_____ in the dark, his head hit against a tree.
A. Walking B. He was walking
C. Walked D.When he was walking
D
分析句子结构。主句的主语为his head 与动词walk 不能构成逻辑上的关系。故不可用分词结构作状语。可用独立主格结构或状语从句。