问题描述：
初中英语奥赛题
The headmaster will be back______
A.in three o'clock B.after three o'clock
C.three hours after D.after three hours
为什么答案是B?其他答案（尤其是D）哪里不对?
The headmaster will be back______
A.in three o'clock B.after three o'clock
C.three hours after D.after three hours
为什么答案是B?其他答案（尤其是D）哪里不对?
问题解答：
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