They are going to learn to play guitar and play basketballA. / theB. a; theC. the; aD. t

问题补充：

They are going to learn to play guitar and play basketball

A. /, the

B. a; the

C. the; a

D. the; /

答案：

A. /, the

B. a; the

C. the; a

(答案→)D. the; /

解析：句意：他们将去学习弹吉他和打篮球。表示玩乐器和球类时，在乐器前加定冠词the，在球类前不加冠词。故选D。