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Don’t touch the machine_________ the tea...

Don’t touch the machine_________ the teacher allows you to.

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

 

B 【解析】 试题分析:句意:除非老师允许,否则不要碰机器。A. if如果;B. unless除非;C. since既然、自从;D. that那么。根据句意可知,故答案选B。 考点:考查连词辨析。  
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