问题
选择题
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
答案：B
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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：B