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

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

【答案】B

【解析】

試題分析:句意:不要碰那個(gè)機(jī)器,除非老師允許A. if 如果,引導(dǎo)條件狀語從句;B. unless表示在特定條件下,才決定做或不做一件事,中文用的連接詞一般是“除非”和“否則”,相當(dāng)于if not;C. since 由于,引導(dǎo)原因狀語從句;D. that一般引導(dǎo)賓語從句和定語從句。在老師允許的條件下才能碰機(jī)器。故選B

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