The doctor insisted that I more fruit and vegetables.A. tookB. had takenC. would takeD.

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A. took
B. had taken
C. would take
(答案→)D. take
解析：考查虚拟语气：insist做为“坚持要求”，宾语从句用sb （should） do，如果是“坚持说”，宾语从句就不用虚拟语气，句意是：医生坚持要求我多吃水果和蔬菜。选D。