问题
选择题
—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
答案
D
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。