His sister is —— the school music festival.横线上填什么?

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Hissisteris——theschoolmusicfestival.横线上填什么?Hissisteris——theschoolmusicfestival.横线上填什么?Hissisteris——t

His sister is —— the school music festival.横线上填什么?
His sister is —— the school music festival.横线上填什么?

His sister is —— the school music festival.横线上填什么?
on
be on 表示:在.上演出,参加.

preparing for 为什么做准备