Look! The boys football on the playground.A. plays B. playC. are playingD. played

问题补充：

Look! The boys football on the playground.

A. plays

B. play

C. are playing

D. played

答案：

A. plays

B. play

(答案→)C. are playing

D. played

解析：动词的时态的用法。在句首出现look，listen等表示引起注意的词，动词用现在进行时，表示正在发生的动作。因此选C。