you eat the correct foods be able to keep fit and stay healthy.
A. Only if; will you
B. Only if; you will
C. Unless; will you
D. Unless; you will
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(答案→)A. Only if; will you
B. Only if; you will
C. Unless; will you
D. Unless; you will
解析：考查倒装句。Only放在句首，强调状语的时候，后面的主句使用部分倒装。本题only放在句首，强调条件句if you eat the correct foods。句意：只有你吃合适的食物，你才能保持健康。