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【题目】People should open the window in the morning to make air (circulation) in order to keep the indoor air fresh.

【答案】circulate
【解析】句意:人们应该在早上打开窗户让空气流通,以保持室内空气新鲜。circulate“循环,流通”;make sb do固定短语,“让某人做.....”不带to的动词不定式作宾语补足语,故填circulate。

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