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】

試題分析：句意：有一些健康方面的問題，如果不及時治療的話，后來問題會越變越大的。空白處的完整結(jié)構(gòu)應是they are not treated。當主句和從句的主語是一致，且謂語動詞是be動詞的某種形式，這時可以省略主語和謂語動詞。故A 正確

考點：考查省略結(jié)構(gòu)

 

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