you eat the correct foodsbe able to keep fit and stay healthy.

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问题 ______you eat the correct foods______be able to keep fit and stay healthy.

选项 A、Only if: you will
B、Only if: will you
C、Unless: you will
D、Unless: will you

答案B

解析句意：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，若选D的话，应当在you will后加上not。only if表示条件，意为“只有”。当only if置于句首时，主句要部分倒装，故选B。

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