说明
含 no, not 的短语引起的倒装
核心问题
We have been told that under no circumstances ____ the telephone in the office for personal affairs. A. did we use B. may we use C. we may use D. we could use 为什么答案是 B(may we use)，而不是 C(we may use)?
词典解答
当含有 no 的成分位于主语之前时，主语和谓语要实行部分倒装：
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In no circumstances must this door be left open. 在任何情况下都不允许这扇门开着。
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Under no circumstances must the door be left unlocked. 在任何情况下都不允许不锁门。
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To no one will they admit their guilt. 他们对任何人都不会承认有罪。
练习题
请做下面的英语试题： ____ the first to use nuclear weapons. A. At no time China will be B. Never China will be C. Will China never be D. At no time will China be