选B
不选A的理由：选A的话,说明enjoy the cool air是 stay up late outside的目的,那么就是一句话,不应用逗号隔开
选B不选C：因为enjoy the cool air是people的伴随状态,应用分词,而people和enjoy这个动作的关系是主动,所以用现在分词
希望可以帮到你
In summer,people usually stay up late outside,----------the cool air.
In summer,people usually stay up late outside,----------the cool air.
a to enjoy b enjoying c enjoyed
a to enjoy b enjoying c enjoyed
英语人气：314 ℃时间：2019-08-11 00:16:16
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