问题
选择题
______ 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
答案
答案：A
句意：只有正确饮食，你才能保持身体健康。从句意可知unless不符合题意。D项应在will后加not。Only if 表条件且位于句首，应用部分倒装。