题目内容
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 have been treated
A。考查 省略、非谓语动词。 when 后面如果用完整的句子表达,它的主语就是problems,因此主语和它后面的be 动词可以一起省略,相当于“ when they are not treated”。
【句意】有些健康问题如果不及时治疗 ,不久可能就变成大问题。

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