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    精英家教网 > 高中英语 > 题目详情
    ________ you understand this rule, you’ll have no further difficulty.
    A．OnceB．UnlessC．AsD．Until
    A
    once引导的让步状语从句，意为“一旦”。句意为“一旦明白了这条规则，就再也没有困难了”。
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