◎ 题干
—Who is playing the piano in the classroom?
—_______ must be Susan. She plays the piano after school every day.  
A.SheB.ItC.ThisD.He
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Who is playing the piano in the classroom? —_______ must be Susan. She plays the piano after school every day.A.SheB.ItC.ThisD.He…”主要考查了你对  【助动词】【介词短语】【固定搭配】【疑问词组】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。