Sally sings pretty and she is also at dancing.A. well; well B. good; well C. well; good

问题补充：

Sally sings pretty and she is also at dancing.

A. well; well B. good; well C. well; good

答案：

解析：根据语境可知sally唱歌非常好，她也擅长跳舞。Sing是谓语动词，故用副词来修饰；而固定短语be good at doing sth表示在某些方面做的比较好，故选C。