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【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 have been treated

【答案】A

【解析】

試題分析：考查非謂語動詞。在該句中，邏輯主語是some health problems，與 treat之間構成被動關系，表示“沒有被治療的話”，所以用過去分詞，這里答案選A項。B，C和D項雖然也都表示“被動“，但B項意為“正在被治療，強調正在進行的動作”；C項意為“將要被治療，意為將來的動作”；D項則意為“早就已經被治療，強調已經完成”，故都排除。

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