题干
The students had much fun soccer after school.
A：playing
B：to play
C：played
答案(点此获取答案解析）
A
The students had much fun soccer after school.
A：playing
B：to play
C：played
的斜面上时，其速度方向与斜面垂直，运动轨迹如右图中虚线所示。小球在竖直方向下落的距离与在水平方向通过的距离之比为
