The examination results suggested that I in poor health,so the doctor suggested that I more exercises to improve it.A. was;tookB. was;takeC. be;tookD. be;take

步骤 1：分析句子结构
句子由两个部分组成，第一个部分是 "The examination results suggested that I in poor health"，第二个部分是 "so the doctor suggested that I more exercises to improve it"。两个部分都包含了一个从句，从句的主语是 "I"。

步骤 2：分析第一个从句
第一个从句 "I in poor health" 是一个宾语从句，作为 "suggested" 的宾语。在英语中，当主句的谓语动词是 "suggest" 时，宾语从句的谓语动词通常使用虚拟语气，即 "should + 动词原形"，其中 "should" 可以省略。因此，"I in poor health" 应该是 "I was in poor health"。

步骤 3：分析第二个从句
第二个从句 "I more exercises to improve it" 也是一个宾语从句，作为 "suggested" 的宾语。同样地，当主句的谓语动词是 "suggest" 时，宾语从句的谓语动词通常使用虚拟语气，即 "should + 动词原形"，其中 "should" 可以省略。因此，"I more exercises to improve it" 应该是 "I (should) take more exercises to improve it"。