-- What’s the matter with you?
--- the window, my finger was cut unexpectedly.
A. Cleaning
B. To clean
C. While cleaning
D. While I was cleaning
网友回答
A. Cleaning
B. To clean
C. While cleaning
(答案→)D. While I was cleaning
解析：动作“clean”与其逻辑主语“my finger”之间是主动关系，故用现在分词作时间状语。