Our English teacher kept telling him that he must not smoke

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Our English teacher kept telling him that he must not smoke in the school ,but _____ didn't help .
为什么填it 而不是 which

因为前面有个but,but 后面接的是复合从句,从句需要一个主语,此处it就是指代前面的内容,泛指“老师的这个要求”.如果把but去掉,就得用which,which 引导的是非限定性定语从句.不知道你有学习过没?非限定性定语从句只是对主句内容,或先行词的补充、解释或附加说明.主句与先行词或从句之间一般用逗号分开,常常单独翻译.没有它,主句意思仍然完整
再问：太给力了，你的回答完美解决了我的问题！

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