warm at night, I would fill the woodstove, then set my alarm clock for midnight so I could
refill it.
A. Staying
B. Stayed
C. To stay
D. Stay
网友回答
A. Staying
B. Stayed
(答案→)C. To stay
D. Stay
解析：句意：为了保暖，我把柴炉填好，然后把闹钟调在子夜，好又添柴。表目的，为了什么，用不定式来表示。
【考点定位】考查非谓语动词中的不定式。