The boy is_____our school music festival,because he sings well
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Theboyis_____ourschoolmusicfestival,becausehesingswellTheboyis_____ourschoolmusicfestival,becausehes
The boy is_____our school music festival,because he sings well
The boy is_____our school music festival,because he sings well
The boy is_____our school music festival,because he sings well
in
attending/ invited to
你把选项补充出来，不然又很多种答案。上面两种都可以。
in