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】考察状语从句连词辨析。once，一旦，相当于if，句意：一旦你开始健康饮食，控制体重就会很容易。根据题意选D .

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