问题
选择题
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
答案
答案：A
题目分析：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
