There are some health problems that, when in time, can become bigger ones later on.A. not

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

(答案→)A. not treatedB. not being treatedC. not to be treatedD. not having been treated解析：考查状语从句的省略：句意为：有些健康问题，如果不及时处理，以后会变得更严重。when not treated in time 为插入语，在本句中为时间状语从句，把that can become bigger ones later on 这个定语从句给隔开了。when 引导时间状语从句时，可以出现省略的现象，但必须满足两个条件：首先，时间状语从句中的主语必须和主句主语一致；其次，从句中含有be 动词。本句中补充完整的状语从句为：when they are not treated in time，其它选项形式不对。故答案为A 项。

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