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【题目】Don’t touch the machine_________ the teacher allows you to.

A. if B. unless C. since D. that

【答案】B

【解析】

试题分析:句意:不要碰那个机器,除非老师允许A. if 如果,引导条件状语从句;B. unless表示在特定条件下,才决定做或不做一件事,中文用的连接词一般是“除非”和“否则”,相当于if not;C. since 由于,引导原因状语从句;D. that一般引导宾语从句和定语从句。在老师允许的条件下才能碰机器。故选B

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