—Who is playing the piano in the classroom? — must be Susan. She plays the piano after sch

—Who is playing the piano in the classroom?
— must be Susan. She plays the piano after school every day.
A. She
B. It
C. This
D. He

A. SheB. ItC. ThisD. He解析：句意：谁在教室里弹钢琴？一定是苏珊。每天放学后她弹钢琴。She她； It 它；This这；He他。指代执行某一动作的人常用It，所以选B。

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