Who is swimming you or she?A. better atB. better inC. good atD. good in

问题补充：

Who is swimming, you or she?

A. better at

B. better in

C. good at

D. good in

答案：

(答案→)A. better at

B. better in

C. good at

D. good in

解析：句意：你和她谁比较擅长游泳？be good at擅长；因为是在you和she之间进行比较，因此要用比较级better，故选A。