Halloween is believed to be a day all the spirits come back to the world of the living a

问题补充：

Halloween is believed to be a day all the spirits come back to the world of the living, and we have the same day in China called “Guijie, the Day of Dead.

A. where

B. when

C. which

D. that

答案：

A. where

(答案→)B. when

C. which

D. that

解析：本题考查定语从句。先行词为day，在从句中作时间状语，故用关系词when，选B。