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

試題分析：句意：只有如果你吃了適當(dāng)?shù)氖澄锬悴拍鼙３纸】�。Only+狀語從句放在句首的時候，句子用部分倒裝，助動詞will放在主語前面，unless“除非，如果不”，不符合句意。選C。
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