单项选择题
Hundreds of years before the birth of Christ, the Celts --the (36) of parts of France and the British Isles-- (37) a festival at the beginning of every winter for the Lord of the Dead. The Celts believed that this god (38) the world in Winter (39) he called together the ghosts of dead people. On October (31) , people believed these (40) of the dead came back to earth in the (41) of animals. They thought that very bad. ghosts came back (42) black cats. (43) their festival on this day, the Celts (44) to make big fires to frighten the ghosts and chase them (45) . This celebration was the (46) of the holiday of Halloween.
The Romans, who ruled the British Isles (47) , also held a (48) at the beginning of winter. Because this was harvest time, the Romans (49) apples and nuts for the Goddess of the garden. (50) the Christians added their customs (51) those of the Celts and the Romans. They had a (52) holiday on November 1 for the saints, (53) they called All Hallows’ or All Saints Day. The evening (54) this day was All Hallows’ Even ("holy evening"); (55) the name became Halloween.
A.after
B.at
C.on
D.before