—What’s the matter with you, Tom?
— the ladder, one of arms has been broken.
A. Climbing
B. While climbing
C. To climb
D. While I was climbing
网友回答
A. Climbing
B. While climbing
C. To climb
(答案→)D. While I was climbing
解析：考查非谓语动词用法。因为one of my arms不能作climb的逻辑主语，故不选A。爬梯子动作的发出者只能是人，由此推断正确答案为D。