◎ 题干
Remember: don't touch anything in the laboratory unless the teacher tells you________.

A. to touch  
B. touch
C. to  
D. to be touched

◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Remember:don't touch anything in the laboratory unless the teacher tells you________.[ ]A. to touchB. touchC. toD. to be touched…”主要考查了你对  【省略句】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。