the window my finger was cut unexpectedly.A. CleaningB. While cleaning C. While I was clea

问题补充：

the window,my finger was cut unexpectedly.

A. Cleaning

B. While cleaning

C. While I was cleaning

D. To clean

答案：

A. Cleaning

B. While cleaning

(答案→)C. While I was cleaning

D. To clean

解析： 本题的含义是当我在擦洗窗户的时候，出乎意料的伤了我的手指，while引导时间状语从句，符合本题，故本题选C。