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______ you eat the correct foods ______ be able to kiip fit and stay healthy.

   A. Only if; you will          B. unless; you will

   C. Only if; will you          D. unless; will you

 ______ you eat the correct foods ______ be able to kiip fit and stay healthy．

     A．Only if; you will                           B．unless; you will

     C．Only if; will you                           D．unless; will you