you eat the correct foods be able to keep fit and stay healthy .
A. Only if , will you
B. Only if , you will
C. If only , will you
D. Unless , you will
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(答案→)A. Only if , will you
B. Only if , you will
C. If only , will you
D. Unless , you will
解析:考查only的倒装句。Only倒装符合两个条件:Only放在句首,且强调状语的时候,使用部分倒装的形式。本题A选项均符合。句意:只有当你食用正确的食物的时候,你才能保持健康。故A正确。