_______ 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(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。
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