What about football?A. playB. playingC. to playD. played

问题补充：

What about football?

A. play

B. playing

C. to play

D. played

答案：

A. play

(答案→)B. playing

C. to play

D. played

解析：根据语境可知此句的含义是踢足球怎样表示的是一种建议。What about doing sth表示做某事怎样，about是介词其后可跟名词，代词或动名词，因踢足球是动作故用ing的形式，故选B。