问题补充：
--- I will take an important test tomorrow.
--- Oh, really?!
A. Good luck
B. Have a good time
C. Well done
D. Good idea
答案：
(答案→)A. Good luck
B. Have a good time
C. Well done
D. Good idea
解析：Good luck祝你好运；Have a good time祝你玩得愉快；Well done 做的不错；Good 好主意。句意：我明天要参加一次重要考试。——哦，真的吗？根据上文可知选A最符合语境。
