He often tennis with his friends. Now they tennis at school.A. play; playB. plays; playing

问题补充：

He often tennis with his friends. Now they tennis at school.

A. play; play

B. plays; playing

C. plays; are playing

D. playing; are playing

答案：

A. play; play

B. plays; playing

(答案→)C. plays; are playing

D. playing; are playing

解析：第一空前有often经常，故应用一般现在时，主语是he，故谓动应用单数第三人称；第二空前有now，故应用现在进行时。故选C。