(The students)are singing in the classroom.就括号部分提出问题_____ _ singing in the classroom

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(The students)are singing in the classroom.就括号部分提出问题
___________ _______ singing in the classroom

Who is
画线部分是主语
所以用who
因为提问的时候不知道人称是单数还是复数
所以统一用单数is

(The students)are singing in the classroom.就括号部分提出问题___________ _______ singing in the classroom