I have learned how to keep my hair . So my classmates.
A. health, have
B. healthy, have
C. healthy, do
D. health, do
网友回答
A. health, have
(答案→)B. healthy, have
C. healthy, do
D. health, do
解析：health健康；healthy健康的；句意：我已经学会了如何保持我的头发健康。我的同学们也已经学会了。Keep后可以接形容词做宾语补足语，主谓倒装结构中助动词，包括连系动词和情态动词的时态要和上句中谓语动词的时态相一致。故选B。