—I am going to take part in the singing competition tomorrow.--.A. Congratulations!B. That

问题补充：

—I am going to take part in the singing competition tomorrow.

--.

A. Congratulations!

B. That’s right.

C. Work hand

D. Good luck

答案：

A. Congratulations!

B. That’s right.

C. Work hand

(答案→)D. Good luck

解析：句意：明天我将参加歌唱比赛。当别人要参加考试，比赛等，要助其好运。A祝贺你，胜利后的祝福语，B你说的对C好好工作D祝你好运。故选D。