-How long did the meeting last this afternoon?
问题描述:
-How long did the meeting last this afternoon?
- How long did the meeting last this afternoon
- It was supper time ______the meeting was over.
答案是when 为什么at which不行?
答
at which 显然是不可以的
which 表示地或物
不是时间
when才是表示时间的