【題目】_______ 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】句意:一旦你開(kāi)始更健康的飲食,控制體重就會(huì)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(yǔ)從句;although引導(dǎo)讓步狀語(yǔ)從句,不能和but連用;before引導(dǎo)時(shí)間狀語(yǔ)從句;once引導(dǎo)具有條件意味的時(shí)間狀語(yǔ)從句。根據(jù)語(yǔ)境和詞義可知選D。

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