Question

–What should I do, doctor?
--________ healthy, you should take more exercise.

A．Keep

B．Keeping

C．To keep

D． Kept

Answer 1

C

考查动词不定式。句意：----医生，我应该做什么？---为了保持健康，你应该多做锻炼。故选C。这里动词不定式做目的状语。