Did he come back early?Yes.It was not yet eight o'clock ___ he arrived homeA before B when选B 为什么不选A

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Did he come back early?Yes.It was not yet eight o'clock ___ he arrived homeA before B when选B 为什么不选A
Did he come back early?
Yes.It was not yet eight o'clock ___ he arrived home
A before B when
选B 为什么不选A

Did he come back early?Yes.It was not yet eight o'clock ___ he arrived homeA before B when选B 为什么不选A
when引导的时间状语从句表示的是一个时间点,主句可以是一个确切的时间,而before则不可.
如:It was just ten when he went to bed last night.

当他回到家还不到8点