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【题目】My neighbour’s dog is fierce and dangerous, so I think he ought to keep it in the yard _____ it attacks any more children.

A. until B. since C. when D. before

【答案】D

【解析】

试题分析:句意:我邻居家的狗又凶又危险,因此我认为在它未攻击别的小孩前应该把它关在院子里。这儿的before可以翻译成未做什么前引导时间状语。故选D

考点: 考查状语从句

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