There are some health problems that, when in time, can bee bigger ones later on.
A. not treated
B. not being treated
C. not to be treated
D. not having been treated
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(答案→)A. not treated
B. not being treated
C. not to be treated
D. not having been treated
解析：考查状语从句的省略：句意：有很多健康问题，如果得不到及时处理的话可能会变得很糟糕。此处非谓语动词做条件状语，其逻辑主语是health problems，被动关系，一般式，相当于when they are not treated in time。注意BCD三个选项与A项的区别：B表示非谓语动词的动作与谓语动词同时发生；C项表示非谓语动词的动作发生在谓语动词之后；D项表示非谓语动词的动作发生在谓语动词之前。选A。