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    精英家教网 > 高中英语 > 题目详情
    I won’t call you, ________ something unexpected happens.
    A．unlessB．whetherC．becauseD．while
    A
    unless引导条件状语从句,意为“除非”,表示“我不会给你打电话，除非出乎意料的事发生”。whether引导让步状语从句或名词性从句,意为“无论是否”或“是否”。because引导原因状语从句,意为“因为”。while引导时间状语从句,意为“当……的时候”，也可引导并列句,意为“而”。
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