when引導(dǎo)的時(shí)間狀語從句表示的是一個(gè)時(shí)間點(diǎn),主句可以是一個(gè)確切的時(shí)間,而before則不可．
如：It was just ten when he went to bed last night.
Did he come back early?
Did he come back early?
Yes.It was not yet eight o'clock ___ he arrived home
A before B when
選B 為什么不選A
Yes.It was not yet eight o'clock ___ he arrived home
A before B when
選B 為什么不選A
英語人氣：641 ℃時(shí)間：2020-01-25 13:15:31
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