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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．untilC．ifD．unless

    C

    解析试题分析:句意：面对严重的事故，如果我们懂得一些基本的急救知识，我们就可以挽救生命。A是否，即使；B直到；C如果；D除非。根据句意可知前句是后句的假设条件，故答案选C。
    考点：考查状语从句。

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