Look ！A boy on the playground. A. runsB. runningC. is runingD. is running

问题补充：

Look ！A boy on the playground.

A. runs

B. running

C. is runing

D. is running

答案：

A. runs

B. running

C. is runing

(答案→)D. is running

解析：句意;看!一个男孩正在操场上跑步. 结合语境可知本句描述的是正在进行的动作, 故用现在进行时态. run是以重读闭音节结尾的单词, 变现在分词要双写最后一个辅音字母, 故选D.