The video shows what happened _ the Open Day at our school.A)about B)on C)in D)from

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The video shows what happened _ the Open Day at our school.A)about B)on C)in D)from
The video shows what happened _ the Open Day at our school.A)about B)on C)in D)from

The video shows what happened _ the Open Day at our school.A)about B)on C)in D)from
on 特指某一天