i took part to a-three-days of summer camp.
I took part in a three-day summer camp.亲：高老师祝你学习进步，每天都开心V_V！望采纳，thx！
I participated in a three day summer camp
a three-day-holiday;i am looking forward to it
trained ... be
I joined a three-day summer camp.
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Herculeses
