When night came.they put up a tentto keep warm．题目和参考答案——青夏教育精英家教网——

题目内容

17．When night came，they put up a tentto keep（keep） warm．

分析到了晚上，他们搭起帐篷去御寒．

解答答案：to keep．结合句意他们搭建帐篷的目的是为了御寒，故用动词不定式做目的状语，所给单词keep是动词保持，故答案是to keep．

点评不定式和不定式短语作目的状语，主要用来修饰动词，表示某一动作或状态的目的．为了使目的意义更加清楚或表示强调意义时，还可以在前面加 in order to 或 so as to．例如：
I've written it down in order not to forget．He shouted and waved so as to be noticed．

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