__________ you eat the correct foods ___________ be able to keep fit and stay healthy.
A．Only if … will youB．Only if … you will
C．Unless … will youD．Unless … you will
A
本題考查的是虛擬語氣的用法。當(dāng)only放在句首，修飾狀語從句、副詞或介詞短語時(shí)，主句的謂語要部分前置，構(gòu)成部分倒裝。其記妙語是：only位句前，狀從、副、介短，部分謂提前。
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