【題目】We had better pay attention to some health problems that, when ________ in time, can become bigger ones later on.

A. not treated B. not to be treated

C. not having been treated D. not being treated

【答案】A

【解析】

考查分詞做狀語。句意：我們最好注意一些健康問題，當(dāng)這些健康問題沒有被及時解決的時候，后來就可能成為了大問題。定語從句的主語that，也就是some health problems與動詞treat構(gòu)成被動關(guān)系，所以使用過去分詞形式，否定式是在前面直接加not。本句也可以理解為是省略句，在when的后面省略了they are。所以A項正確。

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