______ 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
句意：只有正確飲食，你才能保持身體健康。從句意可知unless不符合題意。D項應在will后加not。Only if 表條件且位于句首，應用部分倒裝。
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