not until not beforei knew nothing about the accident ___my friend told me yesterday?答案until但是能不能用before说明理由

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not until not beforei knew nothing about the accident ___my friend told me yesterday?答案until但是能不能用before说明理由
not until not before
i knew nothing about the accident ___my friend told me yesterday?
答案until但是能不能用before
说明理由

not until not beforei knew nothing about the accident ___my friend told me yesterday?答案until但是能不能用before说明理由
不可以用before,但是原因并不是他们说的那样.
如果用before的话句子应该是这样:i had knew nothing about the accident before my friend told me yesterday.
你能懂吗?
就是说主句的时间应该在被告诉时间之前,因此时态上应该再往前推一个

NO UNTIL

可以。用until意为直到我朋友告诉我我才知到，用before意为在朋友告诉我之前我不知道。两者意思一样。
没什么理由，这样做既符合语法，又与原意不冲突

这个地方用固定搭配解释不了的，因为not…until和not…before这两个搭配都是存在的。之所以选择until，是因为句末已经有个时间副词yesterday.不妨直观点来看两句都是正确的话：
1.I knew nothing about the accident until my friend told me yesterday.
2.I knew nothing about...

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这个地方用固定搭配解释不了的，因为not…until和not…before这两个搭配都是存在的。之所以选择until，是因为句末已经有个时间副词yesterday.不妨直观点来看两句都是正确的话：
1.I knew nothing about the accident until my friend told me yesterday.
2.I knew nothing about the accident before my friend told me.
好好揣摩一下，其实before里面暗含了时间的意思，所以如果后面再加个yesterday就有重复之嫌了。

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不能，nothing 已经表示否定，not...until固定搭配

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