He invited me to a dance after the show Christmas Eve.A. at B. on C. in D. by

问题补充：

He invited me to a dance after the show Christmas Eve.

A. at

B. on

C. in

D. by

答案：

A. at

(答案→)B. on

C. in

D. by

解析：此处介词位于具体日期前，因此用on，选B。