(2013·湖南高考) 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：选C 考查非谓语动词。句意：为了晚上保暖，我往火炉中添了木柴，又设置了午夜的闹钟以便再次添加。此处“保暖”是“添加木柴”的目的，所以用动词不定式作目的状语。