_________ you take an active part in physical activity ______ be able to keep fit and stay healthy


  1. A.
    Only if; you will
  2. B.
    Only if; will you
  3. C.
    Unless; you will
  4. D.
    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(dòng)，你才能保持健康。Only后面接狀語(yǔ)從句的時(shí)候，主句應(yīng)該用部分倒裝，助動(dòng)詞will放在主語(yǔ)前面，選B。
考點(diǎn)：考查倒裝句
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