People have a special party the evening October 31 to celebrate Halloween.A. on inB. on

问题补充：

People have a special party the evening October 31 to celebrate Halloween.

A. on, in

B. on, of

C. in, of

D. in, in

答案：

A. on, in

(答案→)B. on, of

C. in, of

D. in, in

解析：

试题分析: 句意：人们在10月31日晚上举行一个特殊的晚会庆祝万圣节前夕。on用在具体时间前，of表所属，故选B.