这是祈使句 unless引导的是条件状语从句
如果用until 引导的是时间状语从句 但这个时间 也许是根本不存在 所以 有逻辑错误
有一中考题：Don't come into the lab______ you are asked to.
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英语翻译11.We are all gonig to the games.Why don't you come up.1