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    精英家教网 > 高中英语 > 题目详情
    In time of serious accidents, _______ we know some basic things about first aid,we can save lives.
    A．whetherB．until
    C．ifD．unless
    C?
    句意为“在遇到严重事故时，如果我们知道一些急救方面的基本知识，我们就能救人命”。If引导条件状语从句表示“如果” 时，不可用whether替换。
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