_________ 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

試題分析：考查倒裝句：句意：只有你積極的參加體育活動，你才能保持健康。Only后面接狀語從句的時候，主句應該用部分倒裝，助動詞will放在主語前面，選B。
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