The weather is fine. The students are having a good time basketball. A. to playB. playingC

问题补充：

The weather is fine. The students are having a good time basketball.

A. to play

B. playing

C. play

D. plays

答案：

A. to play

(答案→)B. playing

C. play

D. plays

解析：句意：天气是好的，学生正在开心地打着篮球。这里是短语have a good time in doing sth开心地做某事。故选B。