_______ you start eating in a healthier way, weight control will become much easier.

A. unless B. Although C. Before D. Once

 

D

【解析】

試題分析：句意：一旦你開始更健康的飲食，控制體重就會變得容易得多。Unless除非；Although盡管；Before 在……之前；Once 一旦。Unless相當(dāng)于if not，引導(dǎo)條件狀語從句；Although引導(dǎo)讓步狀語從句，不能和but連用；Before引導(dǎo)時間狀語從句；Once引導(dǎo)具有條件意味的時間狀語從句。根據(jù)語境和詞義可知選D。

考點：考查連詞詞義辨析及語境理解。

 

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