In the old days, people lived in caves and they had to make a fire themselves warm. A. to

发布时间：2020-08-21 08:38:28

In the old days, people lived in caves and they had to make a fire     themselves warm.
A. to keep
B. keeping
C. keep
D. kept

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(答案→)A. to keep
B. keeping
C. keep
D. kept
解析：本题考查的动词不定式作目的状语，故选A
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