mary is good at[ ]the piano A.play b.plays c.playing d.to play
问题描述:
mary is good at[ ]the piano A.play b.plays c.playing d.to play
答
选c 因为有个词组叫be good at doing something
mary is good at[ ]the piano A.play b.plays c.playing d.to play
选c 因为有个词组叫be good at doing something