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    精英家教网 > 高中英语 > 题目详情
    You cannot take back your words ______ they are out of your mouth.
    A．beforeB．whetherC．onceD．while
    C

    试题分析：句意：一旦这些话从你的嘴里说出，就不能收回了。Before在……之前；whether是否；once一旦；while然而，选C。
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