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

A. Unless       B. Although

C. Before         D. Once

3.    D考查狀語從句。unless"如杲不，除非"，引導(dǎo)條件狀語從句；although"雖然，盡管"，引導(dǎo)讓步狀語從句；before"以前"， 引導(dǎo).時(shí)間狀語從句；once" —旦"，引導(dǎo)時(shí)間狀語從句。句意： 一旦你開始用健康的方式吃飯，體重控制將會(huì)變得容易多了。

題目來源：2015全品語法快練高中英語新課標(biāo) > 訓(xùn)練5從句綜合訓(xùn)練

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