问题
选择题
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
答案
答案：A
本题考查的动词不定式作目的状语，故选A
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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
答案：A
本题考查的动词不定式作目的状语，故选A