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    精英家教网 > 高中英语 > 题目详情
    Don’t promise anything ______ you are one hundred percent sure.
    A．whetherB．afterC．howD．unless
    D
    本句的意思是“不要许诺，除非你有百分之百的把握。”，所以用unless。
    【高考考点】考查连词。
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