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I don't have to introduce him to you__you know the boy A unt

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I don't have to introduce him to you__you know the boy A until B unless C since D but
I don't have to introduce him to you__you know the boy A unt
选 C
since 既然
既然你知道这个男孩,我就没有必要向你介绍他了.
再问: 为什么不选A until 翻译成直到我介绍这个男孩给你你才认识他
再答: until 和not 构成 not ……until ,意思是:直到……才 如果选 until ,句子意思就成了:直到你认识了这个男孩我才有必要向你介绍他。 显然不通顺。 如果要表达“直到我介绍这个男孩给你你才认识他”,英语句子应该是: You didn't know the boy until I introduced him to you.
再问: not ……until是要先翻译从句是吗
再答: 是的。