you eat the correct foods       be able to keep fit and stay healthy .
A．Only if , will youB．Only if , you will
C．If only , will youD．Unless , you will
A

試題分析：考查only的倒裝句。Only倒裝符合兩個條件：Only放在句首，且強調(diào)狀語的時候，使用部分倒裝的形式。本題A選項均符合。句意：只有當(dāng)你食用正確的食物的時候，你才能保持健康。故A正確。
點評：Only倒裝符合兩個條件：Only放在句首，且強調(diào)狀語的時候，使用部分倒裝的形式。
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