Did you see them basketball this morning?A. playing B. were playing C. to play D. are pla

问题补充：

Did you see them basketball this morning?

A. playing

B. were playing

C. to play

D. are playing

答案：

(答案→)A. playing

B. were playing

C. to play

D. are playing

解析：句意：今天早上你看见他们打篮球了吗？see sb do sth 看见某人做过没事，see sb doing sth 看见某人正在做某事。根据句意，本句强调发生过某事，故选A。