问题补充：
When the festival they have been looking forward to , people will dress up to celebrate it.
A. coming
B. comes
C. come
D. came
答案：
A. coming
(答案→)B. comes
C. come
D. came
解析：考察时态和句子结构。本题容易错选A项。实际上定语从句they have been looking forward to是对句子的主语也是先行词the festival进行修饰限制，和谓语动词没有关系。句意：当他们一直期待的节日来临的时候，人们盛装打扮庆贺节日。时间状语从句中使用一般现在时代替将来时，故B正确。
