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。
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