问题补充：
The music she is dancing sounds beautiful.
A. by which
B. to which
C. with which
D. at which
答案：
A. by which
(答案→)B. to which
C. with which
D. at which
解析：考查定语从句。句意她伴着跳舞的音乐听起来很美。固定短语dance to the music随着音乐起舞。故选B。
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