We will have a big test June 12th. Good luck to you.A. inB. onC. atD. by

问题补充：

We will have a big test June 12th. Good luck to you.

A. in

B. on

C. at

D. by

答案：

A. in

(答案→)B. on

C. at

D. by

解析：此题重点考查介词的基本用法，确指的某一天要用介词on。