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【题目】It takes a long time to restore nature_______ it is damaged

A. since B. unless C. once D. until

【答案】C

【解析】分析句子,可知这是一个宾语从句,本题考查的是从属连词的用法,根据句意,可知选D。句意:海伦流着泪冲出了教室,但没人自导她为什么如此地伤心。

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