warm at night，I would fill the woodstove，then set my alarm clock for midnight so I could refill it. (2013·湖南，31)
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：
考查非谓语动词的用法。句意为：为了在晚上取暖，我会填满柴炉，再定好闹钟，以便半夜能起来再填一次。根据语境可知此处用动词不定式作目的状语。故答案选C项。