—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

采、掘工作面及其它地点在放炮作业时，瓦斯检查员不在现场不准爆破。瓦斯检查员必须认真执行（）制度。

A、巡回检查

B、瓦斯检查

C、“一炮三检”和“三人连锁放炮”