Mary can---basketball,but she can't play---piano.a the.../ b

Mary can_play__basketball,but she can't play__the_piano.语法书上有讲,球类运动前不加冠词.乐器前通常加冠词,但有特殊情况,中式的乐器很多都属于特殊情况,例如 play Erhu 二胡.