The little girl looked----at her ----toy car.

选A
sadly 副词 adv.
1.悲哀地;伤心地;令人伤心地
He shook his head sadly.
他伤心地摇了摇头.
sad
形容词 a.
1.悲哀的;令人悲痛的,可悲的
She is still very sad over the death of her
这个女孩看起来很伤心,用形容词sad
broken 在这里是过去分词作定语,修饰这个玩具车.表示已经坏了的