You must eat all kinds of fruits and vegetables a balanced diet.A. haveB. to haveC. having

问题补充：

You must eat all kinds of fruits and vegetables a balanced diet.

A. have

B. to have

C. having

D. had

答案：

A. have

(答案→)B. to have

C. having

D. had

解析：句意：你必须吃各种各样的水果和蔬菜来保持均衡的饮食。不定式在句中表目的，故选C。