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

A. unless B. when

C. though D. because

【答案】A

【解析】試題分析:句意:在實(shí)驗(yàn)室不要碰儀器, 除非老師允許你這樣做。unless連詞,除非,引導(dǎo)條件狀語從句。所以選A。

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