-- 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：考查时间状语从句，while引导时间状语从句，当…时候，句意：--你怎么了？--当我查窗户的时候，手指被割伤了。因为主从句的主语不一样，所以不能用省略式，也不能用非谓语动词做状语。选D。