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       you eat the correct food          be able to keep fit and stay healthy.
A.Unless; will youB.Only if; you will
C.Only if; will youD.Unless; you will
C

试题分析:句意:只有如果你吃了适当的食物你才能保持健康。Only+状语从句放在句首的时候,句子用部分倒装,助动词will放在主语前面,unless“除非,如果不”,不符合句意。选C。
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