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    【题目】____ you start eating in a healthier way, weight control will become much easier．

    A. Unless B. Although

    C. Before D. Once

    【答案】D

    【解析】试题分析：句意：一旦你开始更健康的饮食，控制体重就会变得容易得多。unless除非；although尽管；before 在……之前；once 一旦。unless相当于if not，引导条件状语从句；although引导让步状语从句，不能和but连用；before引导时间状语从句；once引导具有条件意味的时间状语从句。根据语境和词义可知选D。

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