If you feel tired and sick of fatty foods, that is you have to go to the hospital for a medic——青夏教育精英家教网—

摘要： If you feel tired and sick of fatty foods, that is you have to go to the hospital for a medical examination. A. why B. when C. whether D. what

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