What should I do doctor? healthy you should take more exercise.A. KeepB. KeepingC. To

问题补充：

What should I do, doctor?

healthy , you should take more exercise.

A. Keep

B. Keeping

C. To keep

D. Kept

答案：

A. Keep

B. Keeping

(答案→)C. To keep

D. Kept

解析：句意：医生，我该怎么做？你应该做锻炼来保持健康。本题考查动词不定式做目的状语。根据句意故选C.