Question

My sister is good _______ skateboarding. And she swims well, too.

A．for

B．at

C．with

D．in

Answer 1

B

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。