--I think she is at dancing than singing.I think so.A. betterB. goodC. wellD. best

问题补充：

--I think she is at dancing than singing.

--I think so.

A. better

B. good

C. well

D. best

答案：

(答案→)A. better

B. good

C. well

D. best

解析：短语：be good at doing sth擅长做某事，根据题干中的than，可知设空的地方应用比较级，good的比较级为better，所以选A。