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it was ___he came back from Africa that year ___he

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it was ___he came back from Africa that year ___he
met the girl he would like to marry为什么not until that 而不是not till.
it was ___he came back from Africa that year ___he
not until……that……是高中阶段的固定句式,记住就可以了,not till其实也有,只是高中题目中几乎不出现,出现一般也不是正确答案,如果要说区别,until一般指某件事在特定的某件事已经发生之后,而till一般指这件事还没发生,举个例子:
I will sleep till midnight.正确
I will sleep until midnight.错误
I will not do that until this is done.正确
I will not do that til this is done.错误
一般出现not,都会用until