问题
选择题
—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
答案
B
题目分析：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。