_______ you start eating in a healthier way, weight control will become much easier.
A．UnlessB．AlthoughC．BeforeD．Once
D

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相當于if not，引導條件狀語從句；although引導讓步狀語從句，不能和but連用；before引導時間狀語從句；once引導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。
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