15、If you have a fever and keep coughing, that is _______ you have to go to a hospital to have a medical examination.

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

15、C

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If you have a fever and keep coughing, that is _______ you have to go to a hospital to have a medical examination.

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

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