在这里“in about an hour”是指未来的一个小时以内,是未来的一个时间段
如果是用at ,则表示一个具体的时间点
after虽然有“在.之后”的意思,但是在after接时间是时一般是时间状语从句!
I am going home in about an hour.本句中为什么要用in 用at 或after
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