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_______you eat the correct foods_____be able to keep fit and stay healthy.
A,Only if,willyou     B,Onlyif,you will     C,Unless,will you     D,Unless,you will
A

试题分析:句意,只要你吃了合适的食物,你就能健康并且保持健康。Only if表示“只要”,Unless表示“除非”,根据题意,第一个空用Only if;又因为only + 状语 / 状语从句位于句首时,主句用部分倒装。
点评:英语句子的倒装一是由于语法结构的需要而进行的倒装,二是由于修辞的需要而进行的倒装。前一种情况,倒装是必须的,否则就会出现语法错误;后一种情况,倒装是选择性的,倒装与否只会产生表达效果上的差异。
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