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
解析试题分析：句意：有一些健康方面的问题，如果不及时治疗的话，后来问题会越变越大的。空白处的完整结构应是they are not treated。当主句和从句的主语是一致，且谓语动词是be动词的某种形式，这时可以省略主语和谓语动词。故A 正确
考点：考查省略结构
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