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_________ you take an active part in physical activity ______ be able to keep fit and stay healthy.
A.Only if; you willB.Only if; will you
C.Unless; you willD.Unless; will you
B

试题分析:考查倒装句:句意:只有你积极的参加体育活动,你才能保持健康。Only后面接状语从句的时候,主句应该用部分倒装,助动词will放在主语前面,选B。
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