—What should I do,doctor?—__healthy ,you should take more exercise.A.Keep B.Keeping C.To keep D.Having kept选哪个?为什么?

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—What should I do,doctor?—__healthy ,you should take more exercise.
A.Keep B.Keeping C.To keep D.Having kept
选哪个?为什么?

C
to表示目的,后面说你应该更多地锻炼,所以前文应该说为了保持健康
如还有不懂的,还可以继续追问哦\(^o^)/~

c 表目的

C
不定式表目的,“为了保持健康,你应该多加锻炼”