not...until的用法昨天遇到的一道题:- Did Jack come back early last night?- Yes.It was not yet eight o'clock ___ he arrived home.A.before B.when C.that D.until答案给的是B,讲解是时间状语It is...when用法.为什么不能选D呢?

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not...until的用法昨天遇到的一道题:- Did Jack come back early last night?- Yes.It was not yet eight o'clock ___ he arrived home.A.before B.when C.that D.until答案给的是B,讲解是时间状语It is...when用法.为什么不能选D呢?
not...until的用法
昨天遇到的一道题:
- Did Jack come back early last night?
- Yes.It was not yet eight o'clock ___ he arrived home.
A.before B.when C.that D.until
答案给的是B,讲解是时间状语It is...when用法.为什么不能选D呢?
能详细讲解下not...until用法吗?

not...until的用法昨天遇到的一道题:- Did Jack come back early last night?- Yes.It was not yet eight o'clock ___ he arrived home.A.before B.when C.that D.until答案给的是B,讲解是时间状语It is...when用法.为什么不能选D呢?
如果用not until
这样的句子到常见
he didn't arrived home until eight o'clock
他直到8点后才到家
not until是直到…… 才……的意思,表示落后于标准
原句是不到……就……,表示超过标准
意思不一样

It is...when 的意思是: 当。。。的时候,正。。。。 翻译是:当他回来的时候还没有到8点钟。
not ....until 是直到。。(什么)才。。。。。 如he didn't come until 8 o'clock. 直到8点钟了他才回来

not ....until 是直到。。(什么)才。。。。。 he didn't come until 8 o'clock. 直到8点钟了他才回来