Listen,someone____(sing)in the classroom.说明考点,

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Listen,someone____(sing)in the classroom.说明考点,
Listen,someone____(sing)in the classroom.
说明考点,

Listen,someone____(sing)in the classroom.说明考点,
is singing
考点有两个:
someone不定代词作主语,谓语动词用单数
前面出现Listen,后面用现在进行时

is singing

Listen,someone is singing in the classroom.
这里要用一般现在时。