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There are some health problems that , when _______ in time , can become bigger ones later on.

A.not treatedB.not having treated
C.not to be treatedD.not having been treated

A

解析试题分析: 考查非谓语动词。从句子结构可知动词treat和逻辑主语health problems之间是被动关系,而且是指普遍性情况,所以答案选A。句意:有一些健康问题,当不被及时治疗时,以后可能会成为大问题。
考点:考查非谓语动词。

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