what should i do,doctor?A.to keep healthy B.keeping healthy 为什么不选B

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what should i do,doctor?A.to keep healthy B.keeping healthy 为什么不选B

what should i do,doctor?A.to keep healthy B.keeping healthy 为什么不选B
what should i do,doctor?A.to keep healthy B.keeping healthy 为什么不选B

what should i do,doctor?A.to keep healthy B.keeping healthy 为什么不选B
Because
if you choose b,the complete answer will be ' you should keeping healthy'
if you choose a,the complete answer will be 'you should keep healthy'