There are some health problems that, when _____ in time, can become bigger ones later on. A．..

There are some health problems that, when _____ in time, can become bigger ones later on. A．not treated B．not being treated C．not to be treated D．not having been treated

A



试题分析：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。

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