—Where is Jack? —He basketball on the playground. A. playsB. is playingC. is going to pl

问题补充：

—Where is Jack?

—He basketball on the playground.

A. plays

B. is playing

C. is going to play

D. play

答案：

A. plays

(答案→)B. is playing

C. is going to play

D. play

解析：句意：杰克在哪里？他正在操场上打篮球。根据情景该用现在进行时，he是第三人称单数，所以选B。