Tom likes playing volleyball but Lily likes playing piano.A. a aB. the theC. the /D.

问题补充：

Tom likes playing volleyball, but Lily likes playing piano.

A. a, a

B. the, the

C. the, /

D. /, the

答案：

A. a, a

B. the, the

C. the, /

(答案→)D. /, the

解析：句意:汤姆喜欢打排球，但是莉莉喜欢弹钢琴。这里是短语like doing喜欢做某事；在球类运动的名词前面不用冠词；在乐器的名词前用定冠词，根据句意故选D。