【题目】It takes a long time to restore nature_______ it is damaged．
A． since B． unless C． once D． until
在线课程【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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It takes a long time to restore nature it is damaged．A． since B． unless C． once D． until
编辑：chaxungu时间：2026-04-27 02:59:09分类：高中英语题库
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