Who is singing in the classroom?I want to know合为一句

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Whoissingingintheclassroom?Iwanttoknow合为一句Whoissingingintheclassroom?Iwanttoknow合为一句Whoissinginginth

Who is singing in the classroom?I want to know合为一句
Who is singing in the classroom?I want to know
合为一句

Who is singing in the classroom?I want to know合为一句
I want to know who is singing in the classroom.这是who引导的宾语从句,做know的宾语,