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They were difficult for me before they became my habbits.此句中的before能换成until吗?难道这就是所谓的“主句谓语动词强调动作的迟缓性”?

题目详情
They were difficult for me before they became my habbits.此句中的before能换成until吗?
难道这就是所谓的“主句谓语动词强调动作的迟缓性”?
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答案和解析
强调的对象不同.before强调之前对我来说都很困难,until强调的是他们已经成为了我的习惯.并且until习惯上与not连用.not.until.直到……才……