—What should I do doctor?— healthy you should take more exercise.A. To keepB. KeepC. Kee

问题补充：

—What should I do ,doctor?

— healthy, you should take more exercise.

A. To keep

B. Keep

C. Keeping

D. Kept

答案：

(答案→)A. To keep

B. Keep

C. Keeping

D. Kept

解析：

这里考查不定式做目的状语的用法，句意是：我该怎么做，医生？---为了保持健康，你应该多锻炼。选A。