【題目】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 having been treated

【答案】A

【解析】此處是狀語從句的省略形式，補(bǔ)充完整應(yīng)為：when they are not treatedin time. 從句主語與主句主語一致，且從句中含有be的形式，可以將從句中的主語與be動詞同時(shí)省略，只保留not treated形式，因此A項(xiàng)正確。

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