My sister is good skateboarding. And she swims well, too.A. forB. atC. withD. in

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A. for
(答案→)B. at
C. with
D. in
解析：介词辨析。For为了；at在某一点；with带有，伴随；in在里面。句意：我的姐姐擅长滑板运动。她也很会游泳。Be good at doing sth,意思为擅长····意思。故选B。