______you eat the correct foods ______be 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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