这是英语句式中很经典的祈使句加条件句,其中对条件句进行省略处理.
祈使句中不需要主语,且此句又是一个否定的祈使句.until引导的是条件（直到什么时候）.
例如 I won't go to her birthday party unless (I am ) invited to.
根据你的描述你混淆了祈使句的否定形式和反义疑问句(表惊讶,xx竟然xx),反义疑问句：Don't you know the news?（你竟然不知道这个消息?）
Don't come in until （you are ）asked to 按状语从句的省略规则,Don't前应该有一
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相关问题
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Don't come into the room until you_____.A.are asked to B,are
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有一中考题：Don't come into the lab______ you are asked to.
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Please don't talk in class until you are told to
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Don't go out of the classroom until you are asked to带to 为什么?
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Don’t come into the lab ________ you are asked to.A.unless B
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you(don't need to come,don't come,needn't to come)to school
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Don't speak until you are spoken to 求翻译,
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You don't need to come with me 改为同义句You don't ________ _____
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you don't ask you don't get,you don't try you don't know.
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If you don't ask,you don't