题目内容
There are some health problems that , when _______ in time , can become bigger ones later on.
| A．not treated | B．not having treated |
| C．not to be treated | D．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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