-We'll have a hiking trip,but when shall we meet?-Let's make it __ half past eight __the morning of June 21.A.at; in B./;on C./; in填空的话不应该是at和on 据说这是一道中考选择题?

-We'll have a hiking trip,but when shall we meet?-Let's make it __ half past eight __the morning of June 21.A.at; in B./;on C./; in填空的话不应该是at和on 据说这是一道中考选择题?
-We'll have a hiking trip,but when shall we meet?
-Let's make it __ half past eight __the morning of June 21.
A.at; in B./;on C./; in
填空的话不应该是at和on 据说这是一道中考选择题?

-We'll have a hiking trip,but when shall we meet?-Let's make it __ half past eight __the morning of June 21.A.at; in B./;on C./; in填空的话不应该是at和on 据说这是一道中考选择题?
第一个空无 ,第二个空on(因为后面有日期修饰)