—We’ll have a hiking trip but when shall we meet?—Let’s make it half past eight the mor

问题补充：

—We’ll have a hiking trip, but when shall we meet?

—Let’s make it half past eight the morning of June 1.

A. at; in

B. at; on

C. /; in

D. about; by

答案：

A. at; in

(答案→)B. at; on

C. /; in

D. about; by

解析：此题考查介词在表示时间上的基本用法，at用在具体时刻前面；on用在具体的某一天的上午，下午或晚上。