Don't touch the instruments in the laboratory the teacher allows you to do that.A. unless B. whenC. though D. because A [解析]试题分析:句意:在实验室不要碰仪器, 除非老师允许你这样做.unless连词.除非.引导条件状语从句.所以选A. 题目和参考答案——青夏教育精英家教网—

题目内容

Don't touch the instruments in the laboratory ________ the teacher allows you to do that.

A. unless B. when

C. though D. because

A 【解析】试题分析：句意：在实验室不要碰仪器, 除非老师允许你这样做。unless连词，除非，引导条件状语从句。所以选A。

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