Let’s sports.A. to playB. playsC. playingD. play

问题补充：

Let’s sports.

A. to play

B. plays

C. playing

D. play

答案：

A. to play

B. plays

C. playing

(答案→)D. play

解析：句意：让我们做运动吧。let sb. do sth.让某人做某事。此处是动词原形做let的宾语，故选play。故选D。