◎ 题干
单项选择。
— What's your sister doing?
— She is singing a song _______ my mother.
[     ]
A. at
B. to
C. on
D. in
◎ 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“单项选择。 — What's your sister doing? — She is singing a song _______ my mother. [ ]A. at B. to C. onD. in …”主要考查了你对  【介词】  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。