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If you feel tired and sick of fat foods, that is ___________ you have to go to the hospital for a medical examination．

         A．why            B．what          C．when         D．whether

If you feel tired and sick of fat foods, that is _______ you have to go to the hospital for a medical examination.

 A．why          B．what         C．when         D．whether

If you feel tired and sick of fat foods, that is ___________ you have to go to the hospital for a medical examination．

       A．why               B．what               C．when              D．whether

If you feel tired and sick of fat foods, that is ___________ you have to go to the hospital for a medical examination.

A. why         B. what        C. when        D. whether

 If you feel tired and sick of fat foods, that is ___________ you have to go to the hospital for a medical examination．

       A．why                   B．what                  C．when                 D．whether