fit we ought to learn more about our body and be careful with what we eat.A. KeepingB. To

问题补充：

fit, we ought to learn more about our body and be careful with what we eat.

A. Keeping

B. To keep

C. Having kept.

D. To have kept

答案：

A. Keeping

(答案→)B. To keep

C. Having kept.

D. To have kept

解析：非谓语动词考查题。不定式作状语表目的。句意：为了健康我们应该了解我们的身体注意我们的饮食。