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

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

选项 A、not treated
B、not being treated
C、not to be treated
D、not have been treated

答案A

解析 考查动词时态。题干的意思是:“有一些健康问题,如果没得到及时的治疗,在以后会变成更为严重的问题。”分析句子结构可知,此处是状语从句的省略,从句主语problems与treat之间为被动关系,故A项正确,其完整的形式为when they are not treared in time。定语从句that can become bigger ones later on被when not treated in time分隔开来了。
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