【题目】________ 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

【答案】C
【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。此处表目的，用不定式来表示，故选C。