Do they tennis at school?A. playB. playingC. to playD. plays

问题补充：

Do they tennis at school?

A. play

B. playing

C. to play

D. plays

答案：

(答案→)A. play

B. playing

C. to play

D. plays

解析：考查一般现时态。在由助动词do 或does引导的一般疑问句中，行为动词要用动词原形，本句中已有助动词do，故行为动词用原形，故选A