who over there now A,who over there now A,singing B,sing C,is singing 请问,问号选什么?

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whoovertherenowA,whoovertherenowA,singingB,singC,issinging请问,问号选什么?whoovertherenowA,whoovertherenowA

who over there now A,who over there now A,singing B,sing C,is singing 请问,问号选什么?
who over there now A,
who over there now A,singing B,sing C,is singing 请问,问号选什么?

who over there now A,who over there now A,singing B,sing C,is singing 请问,问号选什么?
c,现在分词形式,表示正在发生的事