_______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

試題分析：句意，只要你吃了合適的食物，你就能健康并且保持健康。Only if表示“只要”，Unless表示“除非”，根據(jù)題意，第一個(gè)空用Only if；又因?yàn)閛nly + 狀語 / 狀語從句位于句首時(shí)，主句用部分倒裝。
點(diǎn)評(píng)：英語句子的倒裝一是由于語法結(jié)構(gòu)的需要而進(jìn)行的倒裝,二是由于修辭的需要而進(jìn)行的倒裝。前一種情況,倒裝是必須的,否則就會(huì)出現(xiàn)語法錯(cuò)誤;后一種情況,倒裝是選擇性的,倒裝與否只會(huì)產(chǎn)生表達(dá)效果上的差異。
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